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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: The Ultimate 300B
PostPosted: 10 Jun 2020, 16:22 
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Joined: 03 Jun 2020, 11:06
Posts: 26
Location: France
The Ultimate 300B

I described this projects many years ago on DIYaudio forum. As it is still operating flawlessly, I thought it would be a good idea to describe it here... :)

The prototype was "wooden built" since 2008 :

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But I only could finish them in July 2015 :blush: :

Image

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SPECS :
- dual power mode : 4WRMS (LO) and 8WRMS (HI) by shifting the HV supply.
- input sensivity = 0.8V for 8W output.
- THD = 3% @ 8WRMS 8R 440Hz sinus.
- bandwidth = 10hz-32KHz @-3dB 8WRMS 8R.
- no feedback loop.
- pure class A cathode bias operation.
- die-cast aluminium chassis 275x175x66mm.

Here are the schematics :

Image

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Cheers ! :beerchug:

-tbln

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 Post subject: Re: The Ultimate 300B
PostPosted: 13 Jun 2020, 10:15 
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Joined: 13 Jan 2018, 21:33
Posts: 312
Location: australia
Excellent work! How do you like the sound? I’m quite fond of the 300b myself. Although that is the only valve amp I recall hearing. A hi Fi colleague from the 80s had a quad II but it’s so long ago I can’t recall the sound. Pretty much all of my adult life it has been solid state until lately.

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 Post subject: Re: The Ultimate 300B
PostPosted: 14 Jun 2020, 10:37 
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Joined: 03 Jun 2020, 11:06
Posts: 26
Location: France
Woodo wrote:
Excellent work! How do you like the sound? I’m quite fond of the 300b myself. Although that is the only valve amp I recall hearing. A hi Fi colleague from the 80s had a quad II but it’s so long ago I can’t recall the sound. Pretty much all of my adult life it has been solid state until lately.


Thanks@Woodo ! ;)

I'd say that my Ultimate 300B sounds as expected for a simple and good mono-triode output amp, without "miraculous-superlative revelations"... I did not invented The Hot Water here - except maybe for the compactness - which is my trademark ! :)

Image

No regulators or zeners, nor complex multi-stage preamp section, only stable and reliable "no-hassle" design and performance... :)

Cheers :beerchug:

-tbln

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