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Pictures of your Tube Amplifiers


henry4841

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On 4/24/2024 at 5:19 AM, gromush said:

My modified 300B with custom output transformers and vintage tubes (6sn7 and 5u4G) connected to Forte IV

 

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How is the sound on this 330b for your speakers?

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  • 1 month later...

Something a bit different.

 

Retiring from full time work, had time to design a little 7591 p-p amp.  Solid state, power supplies for HV and bias suppliers. non-inductive B+, metal film resistors, microphone cable for all small signals. separate circuits for chassis and 0V references, filtered AC input, all metal construction, no sheet metal screws.  Top plate is CNC machined, black anodized, 1/4" Aluminum plate stock.  Bottom section 300 series mirror stainless, CNC formed directly from my CAD files using SolidWorks.  Can use Lundahl or Hammond transformers.  Everything but the output transformers sourced from USA.    The graphic overlays are the same material plastic lenses for eyeglasses are made from (optical polycarbonate).  

 

There's a very cool hifi store a few miles from my place where we gave it a listen for most of the afternoon on a pair of Focals and they'd like to have the amp to show in their listening area.  I'll set up but I'm a wee bit hesitant to become an amplifier manufacturer, could be fun but some hassles to.  I'd have to set up a facility.   Then there's the "how do you compete against the Chinese $800 everything tube amps?"   

 

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Thank you gents!

 

1 hour ago, Tarheel said:

 Looks like a McIntosh ML-1C speaker in the corner?

Yes, it is.   I always liked the look of the -1C, the cabinets are old school, 1" thk particle board.  Note the equalizer sitting on the tuner.  Without either the MQ101 or 102 equalizer the ML systems will have poor bass response so, if you buy a buy a pair without the equalizer, you will be unhappy.  

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On 6/5/2024 at 6:27 AM, John Warren said:

Then there's the "how do you compete against the Chinese $800 everything tube amps?" 

Wait, did I miss something?  You're retired, there's zero competition now.  lol  EVERYthing today is pay to play.  You throw it into the mix and people line up, take it at your own pace.  YOU control your destiny.  Chill..  Zero clue what it sounds like tbh but it's a beautiful build.  It HAS to sound fantastic so just sit back and pace yourself.  Just my opinion and you know what opinions are like.  Looks amazing though!  :)

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14 hours ago, Dave1291 said:

Wait, did I miss something?  You're retired, there's zero competition now.  lol  EVERYthing today is pay to play.  You throw it into the mix and people line up, take it at your own pace.  YOU control your destiny.  Chill..  Zero clue what it sounds like tbh but it's a beautiful build.  It HAS to sound fantastic so just sit back and pace yourself.  Just my opinion and you know what opinions are like.  Looks amazing though!  :)

Brilliant!  

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@Dave1291 is right. You won't be competing against chi-fi crap. Those buyers aren't your target demographic. People who want good quality at an honest price are the ones who will seek you out. And you have the convenience of building for whomever you choose.

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9 hours ago, Shakeydeal said:

chi-fi crap.

 

 

Speaking of ^ here is a new to me used Oldchen 300B amplifier; considering what the tubes that came with it are worth the amplifier itself was almost free. I don't like all the white goo everywhere underneath, but it seems to be well built, the transformers are good size (might be crap, but at least not tiny crap). The 300Bs are DC heated and have a neat way of fine tuning with a multi turn pot to eliminate what little hum there is.

It is my first DHT amplifier and although I was kind of wanting a US made 2A3 the price of this amp made it hard to pass up.

 

After having it for a week I'm very happy with the sound and the purchase.

 

 

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Here is another recent budget purchase with some new caps and resistors, an IEC, fuse, and power switch added. Next week it will get binding posts to make it easier to rotate into my systems and a wood bottom to keep me from shocking myself.

This single ended 6BQ5 (6P14P-EV) pentode is just a lot of fun to listen to, it was designed by Magnavox with a bass boost by means of the feedback circuit and the coupling cap. Have not tried it on more full range speakers, but it sounds great with a pair of Fostex wideband drivers.

 

Sorry about the bad picture.

 

 

 

 

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10 hours ago, Shakeydeal said:

@Dave1291 is right. You won't be competing against chi-fi crap. Those buyers aren't your target demographic. People who want good quality at an honest price are the ones who will seek you out. And you have the convenience of building for whomever you choose.

 

Truth and good advice, thank you.

 

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My MC-225 on HF duty with my Jubilee speakers. Sweet, round, musical sound. A tiny bit noisy and perhaps a bit less detailed in comparison to my First Watt J2 but a really wonderful piece of engineering from the 1960s. Velvety sweetness when used with the horns.

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On 6/4/2024 at 12:27 AM, derrickdj1 said:

The OldChen amps sound nice but, the fixed bias is a problem and necessitates opening the amp with power tube changes to readjust the bias due to possible amp damage.

 

Thankfully the 300B amplifiers are cathode bias.

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