Sterling Audio 8-Channel Rackmount Headphone Amplifier for $70 {ends Thur 8am ET}

The current Musician’s Friend daily deal that runs until Thursday 7/29/21 at 8am eastern (or earlier if sold out) is the new condition Sterling Audio 8-Channel Rackmount Headphone Amplifier going for $70 with free US shipping…

Keep in mind this is more of a studio type thing, not an enthusiast headphone amp.

Could be handy if you like to compare multiple headphones (up to eight!) at the same time 🙂

Monday: Senal SMH-1200 studio headphones for $60 [or TOGETHER w/Ultrasone Panther DSD DAC/amp for $260 total]

Headphones return at the May 3 (2021) daily deals of the B&H Photo website good until 11:59pm ET (or earlier if sold out), headlined by the new condition wired closed-back over-ear SENAL SMH-1200 studio headphones offered for $60 with free US shipping. Three color options are available.

These are an alternative to the famous Sony MDR-7506/MDR-V6 duo. Their main accessories are two cables (coiled, flat) and a storage pouch. They have a 3-year limited warranty. As of the time of writing they average 4 out of 5 based on 99 customer reviews.

BUT wait, there’s more! There’s also a “Buy Together and Save” offer. If you buy the Senal headphone together with the new condition Ultrasone Panther DSD DAC/amp you get a $350 off combined purchase discount making the total $260 instead of $610. Both have to be in the cart at the same time for the discount to activate.

In addition to the SENAL offer, among the other Monday daily deals at B&H you can get the new condition Tascam DR-10L Micro Portable Audio Recorder with Lavalier Microphone for $125 with free US shipping. Despite the looks, this does NOT use cassette tapes 🙂 It records on microSD cards, up to 32GB. It is powered by a single AAA battery or via microUSB for constant usage.

Tuesday: Polsen PMA-2B Stereo Personal In-Ear Monitor Amplifier for $25

Not exactly top shelf audiophile but the price is right and this hobby encourages the comparison, experimentation and testing and such, and this is just $25 with free US shipping, one of the B^H Photo daily deals until Tuesday 3/23/21 at 11:59pm eastern time is the new condition Polsen PMA-2B Stereo Personal In-Ear Monitor Amplifier. It even has knobs and one customer review 🙂

PS: for those not familiar, this is a product for the “Pro Audio” market, not the audiophile market, but it has XLR inputs and 3.5mm headphone out, so you can use it as you please. There are of course XLR cables/adapters to match it with your favorite music sources including DAPs, smartphones, etc…

Buy Massdrop’s Objective 2 Headphone amp like a Normal Online Person for $105

If you want to get Massdrop’s Objective 2 headphone amp (either the “Standard” or the “Medium Gain” version) and you don’t want to deal with the Massdrop website’s peculiar way of doing things, then for $105 you can get it delivered to your door “normally” because that’s the price these are sold at Amazon by Amazon actual. And if you are a Prime member you get them even faster!

Just like Schiit Audio does, Massdrop charges a bit more on Amazon to cover their Amazon seller fees, so you are trading off Amazon convenience versus Massdrop shipping and a lower price.

DARKVOICE 336SE OTL headphone amp for $200 [MD]

Among the Cyber Monday promotions at Massdrop there’s an OTL headphone amp, the new condition DARKVOICE 336SE OTL going for $200 with your choice of 110V or 220V. This will ship in early January 2021, so keep that mind if you are looking for holiday season gifts. There is no mention of warranty in the listing…

Speaking of Massdrop, they have a Gaming Value Meal of the non-edible kind. If you start with the Drop ENTR mechanical keyboard page and from there you add the Sennheiser PC-37X gaming headset, and proceed to the shopping cart their total price will drop from $180 ($90 each) to $150. A combined purchase discount. No coupon is needed, this happens automatically during this limited time promotion…

Another one of their offers if you are interested in Mr Dan Clark Audio (DCA) ear-speakers (ha!). They are offering the new condition Drop + DCA AEON open X headphones of the V-Planar magnetic kind for $450 with free US shipping and free US returns. This is an in-stock drop, it will ship in a couple of business days… Optionally you can add a 3-year Drop extended warranty for +$40…

Monolith Black Friday sale at Monoprice

Monoprice’s Monolith high-end audio brand is having its Black Friday sale as well. This includes speakers and subwoofers, but when you further page down over there you will find their headphone offerings. A total of eight products are on offer, five headphones and three DAC/amps!

Planar Open-Back Over Ears
+ M570 for $200
+ M1070 for $300
+ M1570 for $400
+ staircase prices in full octaves 🙂

+ M350 planar earphones for $90
+ M-TWE truly-wireless for $100

+ Monolith USB DAC for $70
+ Monolith THX AAA Balanced Headphone Amplifier for $330
+ Monolith Liquid Platinum Balanced Headphone Amplifier by Alex Cavalli for $400

Used Sabaj D2 DAC/amp for $28 [NEW for 34 euro]

This is a general purpose “organic” deal, not a Prime deal, so anyone can get it. Furthermore this is mixed USA/EU, so please do pay attention to the location of each item mentioned below…

If you are in (or shopping from) the Amazon USA, Amazon Warehouse Deals actual has in “Used – Like New” condition the Sabaj D2 DAC/amp for $28 with free US shipping. This is in the silver-black color scheme. The new condition price is $42 in either color scheme.

Those shopping in the EU, y’all can get the new condition in the black/silver color scheme for 34 euro at Amazon Germany

As of the time of writing, it averages 4.2 out of 5 based on 55 ratings at Amazon USA, and 3.9 out of 5 based on 35 ratings at Amazon Germany [mayhaps those East Germany gymnastics judges are audiophiles as well?].

These have three audio inputs (microUSB, optical, coaxial) and has RCA output [for the DAC part] and 3.5mm headphone output.

Monoprice Headphone Sale includes Planars and DACs

Monoprice continues to march on with their headphone products and as such, they are having a limited-time headphone and earphone sale that features a soccer team [= eleven] products as follows:

+ Closed-Back Planar Magnetics: M565C for $175, M1060C for $270

+ Modern Retro closed over-ears for $23
+ may remind you heavily of Samson/Superlux 🙂
+ I have here a text and pictures unboxing of their semi-open cousin 🙂

+ Quintet (2 dynamic, 3 BA) wired in-ears for $50

+ two truly-wireless ($60 each) and two bluetooth over-ears ($34 and $60 each)

+ Monolith portable headphone DAC/amp with THX AAA for $270

+ Monolith balanced headphone amp for $375

+ Monolith desktop balanced DAC/amp for $450

And that’s it 🙂

Tuesday: iFi PRO iDSD Desktop DAC, Etc

No Beyerdynamic coupons today at NewEGG but for Tuesday 7/28/20 there’s some interesting audio action at the Woot “Choose Your Tech Deal” sale that includes:

+ iFi PRO iDSD desktop DAC for $2000

+ PAww SilkSound very minimalist on-ears for $38

+ Rees Harps SE for $800
+ sorry but “The Doors of Stone” are NOT included with purchase 🙂

Meanwhile the main Woot deal du jour is a sale on Logitech ASTRO gaming headsets ranging from $120 to $165…

If you are looking for a popular budget bluetooth 5.0 truly-wireless in Europe, Amazon Germany is offering the new condition TaoTronics Bluetooth 5.0 for 33 euro. As of the time of writing it averages 4.3 out of 5 based on 460+ customer ratings…

Last (and probably least) the Best Buy dailies have a 3-month TiDAL Hifi trial for $0.99 for those three months, while on the truly-wireless front it’s yet another JBL option, the “FREE Gen 2” going for $73…

Back In-Stock: Massdrop Objective 2 Head-Amp for $95 [110V Medium Gain only]

If you are a current or future member of the “Cult of the NwAvGuy”, we have good news for you! It is back in-stock at Massdrop, the new condition Massdrop Objective 2 headphone amp going for $95 with free US shipping. Up to ten per customer per shopping cart. Note however that only the 110V Medium Gain power adapter is available. The other three options are not available [greyed out in the shopping cart].

This is an “in-stock drop”, so it will ship quickly (but keep in mind COVID-19 is adding potential delays)…

Bravo Ocean Tube (12AU7) head-amp for $55 [MD]

Want something to remind you of …the ocean while listening to music? How about the new condition Bravo Ocean Tube headphone tube amplifier (12AU7) with two headphone outputs (3.5mm and 1/4″) going for $55 with free US shipping at Massdrop’s website for the next two days and change from blog-posting time. It has two inputs as well, RCA and 3.5mm, and an RCA pre-amp output as well.

There is no mention of warranty in the listing. Orders will ship in late April 2020…

RadSone Earstudio ES100 Mark II for $85 [MD]

IF you are looking for a DAC/amp that resembles a Sandisk Clip rather than the traditional powerbank-thick portable DAC/amps, Massdrop is running an offering on the new condition RadSone EarStudio ES100 Mark II for $85 with free US shipping. This will ship in late April 2020. There’s no mention of warranty in the listing.

Optionally, you can buy it together (via their shopping cart) with the HE100 in-ears for $40 more, making it a $125 total. The HE100 are NOT included standard. Their specs are at the bottom of the Massdrop product page for reference only. You have to buy them for +$40 if you want them.

On the other hand, if you don’t want to wait until the end of April 2020, there are many options available at Amazon as follows:

  • new condition Mark II for $100, USED for $87
  • “Amazon Renewed” Mark II for $80
  • new condition Mark I for $90
  • “Amazon Renewed” Mark I for $70

What is Amazon Renewed?
It’s an Amazon program that encourages sellers to offer high(er) quality and tested non-new products with a minimum 90-day warranty. These can be refurbished, open box or used. What matters is their quality and warranty. To get a better feel for it, these are the requirements for sellers wanting to offer “Amazon Renewed” products…

Chord Mojo portable DAC/amp for $399

If you can’t resist those adorable little round buttons, the Chord Mojo portable DAC/amp is currently on sale by various recognizable marketplace sellers for $399 with free shipping at Or you can go used with $349 over there.

PS: as usual, when buying audio gear from online marketplace that have multiple sellers like Amazon, eBay, Newegg, etc, make sure you check who the seller is and whether they are an authorized dealer…

Big Monoprice Monolith sale with new low prices (17 options, headphones, amps, etc)

Monoprice has launched a big Monolith audio sale featuring 17 different products, mostly of headphone interest!

On the headphone front, the open-back over-ear M1060 planars go for $200 while their closed counterpart (the M1060C) go for $250. On the dynamic front, the M600 open over-ears are down to $60, while the M650 are down to $80. A not-so-subtle name-homage to the world-famous Sennheiser HD6?? duo 🙂

Back to the planars, the M560C closed-back (as that “C” hints at) is down to $170, while the sole earphone (can’t really call them in-ears) of the lot, the M300 is down to $70.

Come on Barbie, let’s have an electrostatic party because their Electrostatic headphone with amp combo is down to $354~.

Find them all at the Monolith audio sale

Speaking of amps, the big old Tube amplifier is down to $190, while vinyl fans have the Monolith turntable at their disposal for $150.

On the balanced headphone amp front, the Cavalli Liquid Platinum is down to $700, while their portable THX AAA DAC/amp goes for $250.

The rest of the sale items are speakers of different kinds. For those, check our imaginary speakers blog 🙂

Budget Prozor Switcher DAC for $11 [with headphone out]

On the budget and utilitarian side of things, if you want a DAC that’s also a switcher and you are interested in converting optical/TOSlink and coaxial audio inputs to RCA and 3.5mm headphone out, for a limited time, Amazon USA is offering for a limited time the new condition Prozor Switcher DAC for the very specific price of $10.83. You can buy as many as you like.

It has two optical and two coaxial inputs with an indicator light next to each input. A switch on the back of the device (where the inputs reside) switches optical to coaxial. The front has three audio outputs, 3.5mm headphone, RCA and optical output too. Power is a DC 5V/1A on the front of the device. Having said all that, “back” and “front” is a relative term for a device like this since there’s no volume knob or other setting that could need frequent adjustment 🙂

It averages 3.8 out of 5 based on 30 ratings and it has ten answered questions. This is the first time I’ve seen this while wondering around Amazonia for budget DAC/amps.

Refurbished Schiit Magni 3 head-amp for $95

If you are interested in the Schiit Audio headphone amps and want to pay less than full price, Schiit Audio’s Amazon store is offering it in certified renewed condition for $95 with free shipping. The order is fulfilled by Amazon, so Prime members get it for free. Products that are part of this “Amazon Renewed” program get a minimum of a 90-day warranty…

Monoprice Refurbished and Open-Box sale

Monoprice is running a refurbished & open-box sale with a variety of products on their website including headphones. The link above points to the headphone-related products. If other product categories interest you, you can use the options on the left side of the page over there.

Of headphone interest, a number of the over-ear headphones are available (planar and dynamic) starting at $99. Also part of the sale are their planar earphones (M300) going for $79, the giant Monolith tube head-amp for $299, the Monolith Cavalli Liquid Spark head-amp for $80, etc.

AS usual with Monoprice, price-check both the new condition and the refurb/open-box products as the sale prices may not be in-sync (eg you may be better off getting the new condition).

These inspected and tested refurbs and open-box products get a 90-day warranty along with 30-day satisfaction guarantee, so you are not left twisting in the wind in case of a lemon or a non-agreeable product.

Sunday: B&W C5 S2 and Beats X In-Ears, 6-ch Marantz head-amp

A trio of headphone-related daily deals is happening on Sunday 9/8/19 as follows, ending at 11:59pm in the timezone of each retailer below (or earlier for any item that manages to run out ahead of its designated expiration time):

+ Bowers & Wilkins C5 Series 2 wired in-ears for $120 at Best Buy

+ Marantz Professional RHA6 6-Channel Headphone Amplifier for $75
at B&H Photo

+ Beats X bluetooth earphones (new condition with 1-year Apple warranty) for $70 at Woot Electronics

DarkVoice 336SE OTL head-amp for $200

Is the name a spoiler for the sound signature? I won’t spoil it but good for the next three days and change [from blog-posting time] is the return of the new condition DarkVoice 336SE OTL head-amp at Massdrop. Orders will ship in late October 2019 from Massdrop. There is no mention of warranty in the product listing. Over 2,600 units have been sold through Massdrop per the statistics shown on the page over there…

Monoprice Summer Clearance with FREE US shipping: Protein Leather Pads for $10, M600 Open Over-Ears for $60, Monolith Tube amp for $280, Electrostatic Headphone + Amp for $350, Etc

The Monoprice Overstock sale has some potentially interesting offerings for headphone fans as well. A total of seven options show when you filter for headphones including:

+ Memory Foam Protein Leather earpads for $10

+ MP20 in-ears for $12

+ M600 open-back dynamic over-ears for $60

+ M1060 planar open over-ears for $250

+ monster-sized Monolith Tube amplifier for $280

+ Electrostatic headphone with dedicated amplifier for $350

+ the M300 planar earphones go for $100 [corrected typo] which was their previous price

+ find them all in the Headphones Clearance page

All the items mentioned above come with free US standard shipping during this promotion. No coupon is needed. When the free shipping offer ends, it will simply stop being mentioned at the individual Monoprice product pages.

EU: SABAJ Audio A1 Class D HIFI Digital Amplifier for 30e after coupon

This is NOT a headphone amp BUT the discount is big enough it might be of interest. At Amazon Germany, the new condition SABAJ Audio A1 Class D HIFI Digital Amplifier goes for 50 euro. As of the time of writing, there is a 40% off (yes, forty percent off) clip-on coupon on the product page. Once you clip the coupon (click the little empty box next to its name) you will get a 40% off discount on the current price, making it *calculating* *calculating* just 30 euro with free shipping in Germany/etc or plus shipping in most other countries.

The 40% off offer is only available on the black color scheme (schwarz), not the silver (silber).

EarStudio portable DAC/amp & BT receiver for $79 or 79 euro [Prime Deal]

Finally a “synchronized” prime deal! For a limited time, Prime members on both sides of the pond can get the sale on the new condition EarStudio portable DAC/amp and bluetooth receiver! It goes for 79 euro at Amazon Germany and for $79 at Amazon USA. This is for Prime members only as are most of today’s deals…

Sabaj D2 DAC/amp for $42 [Prime Deal]

One more offer for Prime members! An $18 off automatic discount in the shopping cart drops the price of the new condition SABAJ D2 DAC/amp to $42 with free shipping in the black color scheme. This has three inputs (USB, coaxial, optical [see gallery picture #3 over there), and headphone output (obviously, how else can it be a headphone amp) and RCA output. This can also be charged via the 5V USB on the back, so it is portable as well as desktop.

It averages 3.5 out of 5 based on seven customer reviews, so read up on it if curious…

Schiit Fulla 2 DAC/amp for $99 after coupon

It’s something you don’t see everyday! The official Schiit Audio Amazon store is offering a $20 off clip-on coupon on the new condition Schiit Fulla 2 DAC/amp that drops its price from $119 to $99. You have to be logged on to an Amazon account in order to clip the coupon. The order is fulfilled by Amazon, so you get Prime shipping anyway.

Here’s a screenshot of what to look for at the Amazon product page. Note that the coupon only works if the seller of record is Schiit Audio (Schiit’s official Amazon store)…

Now Shipping: Massdrop Objective 2 Headphone Amp (Desktop Edition) for $95 w/FUSS [MD]

Hide your e-wallets, although, considering the price-ranges of audiophile gear, this won’t do as much damage as some other CLEAR options that can put the FOCAL point of money drain on your ELEG(I)ANT wallet, probably purchased from Massdrop too 😉

With that obligatory throw-all-the-tomatatoes-at-me joke out of the way, we have good news if you are a fan of the Objective 2 headphone amp. The desktop edition of the Massdrop edition is now shipping (actually shipping) at the Massdrop website for $95 with free US shipping.

The shipping estimate as of the time of writing is July 10 in 2019, a miracle by Massdrop standards 🙂 This has become an “In-Stock Drop” that’s why it ships so fast ~ one business day after the close of the calendar day of your purchase. Your card will be charged two hours after ordering, so you have that regretsy window 🙂

During the checkout process you have two decisions to make. One is utilitarian, 110V or 220V adapter to be included. The other is more philosophical: standard gain or medium gain. Or you can get both and resolve the never-ending internal and external debates 😉

In addition to the free US shipping, they have two expedited shipping options, a +$5 and a +$15 which promises a 2-business day arrival. I wonder if it’s only a matter of time before Massdrop offers some kind of a Prime-like membership plan that includes faster shipping? [this is only a crackpot theory, I have no inside or outside knowledge]

PS: I’m planning to set out some time so I can update the two Massdrop “Tracking” perma-posts I used to keep updated 🙂 Stay tuned on that ~ no promises 🙂

Monoprice sale w/FUSS: M650 Open Over-Ears $120, Mega Tube Amp for $340, MP10 IEMs for $8, Etc

All the offers mentioned in this post below include free standard US shipping as of the time of writing of this post…

Monoprice is running another headphone-related sale with a variety of products, big and small. From small earphones to boulder-sized amplifiers 🙂

+ speaking of which, the Monolith Tube Headphone amplifier with ESS Sabre DAC is going for $340

+ Monolith M650 open-back over-ears for $120
+ the M600 and M650 are not planar-magnetic; you are correct, the model names are an “homage” to certain “Heiser” headphones ^_^

+ metal headphone stand for $18

+ MP-10 in-ears for $8
+ yes, despite the low price, you still get free standard US shipping while this promotion is running ~ after all IEMs can ship easily and don’t take up lots of space and can probably be shipped easily even with USPS first class mail [only guessing here, I have no clue how they will ship these]

+ Retro over-ears for $22.49
+ you are correct if it reminds you of a certain Superlux/Samson headphone 🙂

+ Monoprice 8323 with bluetooth for $23
+ the good old model now with bluetooth (and apt-X). I haven’t seen this new model but I had the 8323 and larger heads were not an easy fit. It also expands a bit strangely on your head, so if you are image-conscious note that when you are using it at coffee shops and libraries and such

PS: “FUSS” = Free US shipping and handling…

Dark Voice 336-SE OTL headphone amp for $200 [MD]

Amp time at Massdrop! Good for the next five days and change, you can get the new condition Dark Voice 336-SE OTL (output transformer less) headphone amp for $200 with free US shipping. Orders will ship from Massdrop in mid-August. There’s no mention of warranty in the listings. You do have an option of power supply during the checkout process, so you can get 110V or 220-240V. Per the listings there, over 2,500 units have been sold of this through Massdrop…Dar

Monoprice Monolith Tube Headphone Amplifier with ESS Sabre DAC for $330 w/FS

CORRECTION: the post-title had the sale price as $320 instead of $330. The text of the post had the correct price of $330…

This came out during the Monoprice big bangs of new products, and it is currently on sale and with free standard US shipping, which is a big plus, because this is a big boy, it’s not a tiny portable headphone amplifier – quite the opposite.

Not to turn this into a reading comprehension exam, but in this case, “this” refers to the new condition Monolith Tube Headphone Amplifier with ESS Sabre DAC on sale for a limited time for $330 with aforementioned free standard US shipping. You can buy up to twenty ~ although I doubt any non-commercial customer will get anywhere near that number.

XDuoo XD-05 DAC/Amp for $160 [MD]

Massdrop is back here again with another live offer, running for the next five days and change, it is the return of the new condition XDuoo XD-05 DAC/Amp offered for $160 with free US shipping. International shipping is under $15, varying a little by location. It is available in your choice of silver or black color scheme.

It has three inputs (USB, 3.5mm, SPDIF) and 3.5mm audio output, in addition to (of course) the headphone output on the front. It supports up to DXD and DSD ~ in addition to PCM of course. Its discussion at MD has over 1000 posts, and it has 21 customer reviews over there with an average of over 4 out of 5…

Orders will ship from Massdrop in late May 2019. There’s no mention of warranty in the listing ~ other than to say that a warranty card is included in the box.

Audioengine D3 Portable DAC/Amp for $65 [MD]

More and more things are getting added. This time we have the Audioengine D3 Portable DAC/Amp going for $65 with free US shipping at the Massdrop website. International shipping appears to over around $4.

This will ship in late April 2019 from Massdrop. There’s no mention of warranty in the product listing. It comes with a carrying case and an adapter cable. It runs for the next four days and change [from blog-posting time here]…

Monoprice portable DAC/amp w/THX AAA for $250, Bluetooth Receiver with apt-X for $40

One of the big bang Monoprice audiophile products is currently on sale, it is the new condition portable Monolith DAC/amp with THX AAA going for $250 instead of its standard price of $280…

Meanwhile the new condition Monoprice bluetooth streaming receiver with apt-X and NFC is on sale for $40 with free standard US shipping. It averages 3.9 out of 5 based on 80+ customer reviews at the Monorprice website… It receives music through the ether (the bluetooth receiver part) and outputs it either via 3.5mm or S/PDIF TosLink digital optical… A couple of audio cables (for the 3.5mm port) are included…

Creative Labs SX-FI DAC/amp bundled with Aurvana SE Over-Ears for $140 [MD]

Everybody’s jumping on the Massdrop hype train, including Creative Labs [now just “Creative”] with their Super X-Fi technology. Their new condition SX-FI DAC/amp is currently fully unlocked for $140 with free US shipping for the next five days and change from posting time. International shipping hovers around $5.

But this is not just a DAC/amp. This bundle also includes the Aurvana SE closed-back over-ear headphones, based on a Fostex-the-people design [okay, Fostex design; sorry, I can’t resist]. They have 32 ohm impedance and 40mm drivers.

Massdrop will ship these orders in late April 2019. There is no mention of warranty in the product listing over there…

Little Dot Mark III for $200, SE for $460 [MD]

It’s a Little Dot that leaves a big dent in the wallet 🙂 Running for the next four days and change at Massdrop is a sale on new condition Little Dot Mark III headphone amps. The base edition goes for $200, while the SE (Special Edition) goes for $460. They have two input tubes and two output tubes.

The SE is balanced and has more power among other things. These will ship in mid-May 2019 from Massdrop. There’s no mention of warranty in the listing…

Audirect Beam Portable DAC/Amp for $75 [MD]

The sub-$100 “laptop” DAC/amp segment has more and more options these days, and of those new options is offered at Massdrop, it is the new condition Audirect Beam Portable DAC/Amp going for $75 with free US shipping and low international shipping (hovering around $5 depending on country ~ and of course I can’t test all countries)…

There are two color options at checkout. They will ship in late April 2019 from Massdrop. There’s no mention of warranty in the listing. It comes with a trio of cables so you can use it with Android (USB-C) and iOS (Lightning) and “real” computers (USB Type A)…

EU: Sabaj PHA3 Vacuum Headphone Amp for 50 euro

If you are looking for a budget vacuum headphone-amp, Sabaj is currently offering their PHA3 model for 50 euro, sold by the Sabaj online store with the orders fulfilled by Amazon Germany. This is the black color scheme.

Being an amp, this has an RCA audio input and a 3.5mm analogue input. The output is a 3.5mm headphone out. It has just one headphone-out (as most amps do), unlike their previously mentioned PHA-2 model which has one 3.5mm and one 1/4″, with slightly different impedance to support a different (but overlapping) range of headphones…

For more on the PHA3 vacuum amp, there are nine customer reviews of it at with a 4.6 out of 5 and it has five answered questions as well…