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Single Ended 2A3/6A3/6B4G DC coupled & Transformer choices
Single Ended 2A3/6A3/6B4G DC coupled & Transformer choices
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Old 22nd February 2018, 11:07 AM   #11
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Hi soulmerchant,

It is hard to beat the German post small-signal tube as an input/driver (C3g, C3m, D3a .... etc).

What is the input voltage in your DC C3g-2A3 amp for maximum output power?
About 1Vrms, or so ??
Maybe C3m would be more applicable, imho.

For me, in amplifier good input/driver stage is more important than Oriented HiB, Amorphous or M3 grain oriented core in OPT.

Last edited by RajkoM; 22nd February 2018 at 11:29 AM.
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Old 22nd February 2018, 07:52 PM   #12
Perfectusaudio is offline Perfectusaudio  Australia
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Driver stage sets the stage for the rest of your amplifier
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Old 22nd February 2018, 08:13 PM   #13
Perfectusaudio is offline Perfectusaudio  Australia
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Anyone tried a D3A triode strapped DC coupled to a 2A3 ?

I also have some WE409A will triode strap those soon into a 6A3 output stage
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Old 22nd February 2018, 08:40 PM   #14
TheGimp is offline TheGimp  United States
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Quote:
Originally Posted by Perfectusaudio View Post
I tend to use a pair of Sprague V735P 10uf/400v in parallel on the 2A3 cathode .

They are excellent in this position and have been the main stay of Yamamoto amps for years
Mouser lists them as no longer manufactured.
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Old 22nd February 2018, 10:24 PM   #15
Perfectusaudio is offline Perfectusaudio  Australia
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soon 10uF/400v from Mouser
now CDE 735P
Cornell Dubilier 735P Series Film Capacitors | Mouser Australia

I have a box of NOS Sprague V735P 10/400
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Old 24th February 2018, 06:06 AM   #16
Perfectusaudio is offline Perfectusaudio  Australia
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Mouser CDE 935
5984-400V10-F
These are very close indeed to the V735P
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Old 24th February 2018, 09:33 PM   #17
Perfectusaudio is offline Perfectusaudio  Australia
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Sorry missed the post including the D3A triode strapped
I have had reports this tube is clean but bright !
Any comments on those who have used this tube on its overall presentation
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Old 24th February 2018, 10:19 PM   #18
RajkoM is offline RajkoM  Bosnia and Herzegovina
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I tried D3a in some of my SET amplifiers; in triode and pentode mode.
Bright ??? No, never.
Attached Images
File Type: jpg D3A`s.jpg (59.3 KB, 290 views)
File Type: jpg 6C33C-SET1.jpg (41.2 KB, 285 views)
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Old 24th February 2018, 11:01 PM   #19
SemperFi is offline SemperFi  Wake Island
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Quote:
Originally Posted by Perfectusaudio View Post
Driver stage sets the stage for the rest of your amplifier
And the input stage sets the stage for the driver stage.... lol sorry couldnt resist.
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Old 25th February 2018, 12:41 AM   #20
Perfectusaudio is offline Perfectusaudio  Australia
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Default D3A

Very clever but what about the D3A
Any comments on that tube
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