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Old 14th June 2004, 08:30 AM   #1
arnoldc is offline arnoldc  Philippines
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Default PP2A3 amp options

hi diyers,

i've been contemplating on making a PP 2A3 amp and i've been looing hard and long on this schematic for a month now.

Click the image to open in full size.

and i'm still looking because i don't have a source for the 6A6

duncan amp does not show viable alternatives so i'm pretty stuck. does any of you know what i can put in there?

or maybe i can convince frank (fdegrove) to post his PP 2A3 schema here
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Old 14th June 2004, 10:29 AM   #2
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While it is not electrically equivalent but merely a good driver tube...

I would consider ECC99, 5687 or 6SN7...to name just a few...

However you would have to change the cathode resistor....(edit) Looks like you could just drop it in...after reading KYW's post. (With a different socket and hookup ofcourse)

So a good alternative would be to look at a different PP2A3 schematic.

Cheers,
Bas
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Old 14th June 2004, 12:14 PM   #3
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Just found a recent thread on AA discussing the same schematic you posted.

http://www.audioasylum.com/forums/tu...ges/55741.html
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Old 14th June 2004, 01:17 PM   #4
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Default Re: PP2A3 amp options

Konnichiwa,

Quote:
Originally posted by arnoldc
i've been contemplating on making a PP 2A3 amp and i've been looing hard and long on this schematic for a month now.

Click the image to open in full size.

and i'm still looking because i don't have a source for the 6A6
As others have said, many different Valves can drop in there with no change. I'd personally take a hint from Dr. Arthur Loesch and use a 5687, with a suitable 56 or 76 as input or perhaps a 53. You find this kind of lineup (56/5687 especially) in the rightly highly acclaimed Loesch/Wiesner SE Amp's and the 56/53 lineup in their conversion of the Webster Theathre Amp's:

http://www.plasmatweeter.de/pp_amp.htm

Sayonara
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Old 14th June 2004, 11:22 PM   #5
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Default Re: PP2A3 amp options

Quote:
Originally posted by arnoldc
and i'm still looking because i don't have a source for the 6A6

6N7 is same as 6A6, but has an octal base.
Shouldn't be much trouble to locate 6N7.

53 is same as a 6A6 but has a 2.5 volt filament.
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Old 15th June 2004, 01:46 AM   #6
arnoldc is offline arnoldc  Philippines
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hi guys,

uncle ned, thanks for the sub information. i plan to get some parts for other projects from you soon, while some of my colleagues are in the u.s.

kyw, 5687! perfect! i have a bunch of those and are not hard to find in the Philippines. if they do drop in then that's really ideal. as for the input tube, i have a bunch of 56s and 76s that i can use.

btw, the designer seems familiar... i think i've downloaded one of his schema before - a 56 DC'ed to 2A3. though i have not built it.

his PP 2A3 looks good to if i can find a 53

bas, thanks for the link. i checked them out and i'll also follow the progress.

when i grow up i will build the lynn olson amps

thanks to all

frank, you there? still interested to share your schema? don't worry you don't have to, just tell me and i'll shut up
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Old 15th June 2004, 04:55 AM   #7
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Hi,

Quote:
frank, you there? still interested to share your schema?
I don't mind at all...it's just that I'll have to draw it up first, won't I?

I will give you a description to go by soon.

Cheers,
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Old 15th June 2004, 05:43 AM   #8
EC8010 is offline EC8010  United Kingdom
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Default Frying tonight...

Looking at that diagram, each 2A3 is dissipating 22W. The RCA data sheet says 15W maximum, so don't put NOS 2A3 in there.
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