| arnoldc |
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.
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 :D |
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| Bas Horneman |
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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| Kuei Yang Wang |
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.
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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| UncleNed |
| 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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| arnoldc |
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 :xeye:
bas, thanks for the link. i checked them out and i'll also follow the progress.
when i grow up :smash: i will build the lynn olson amps :D
thanks to all :)
frank, you there? :D still interested to share your schema? ;) don't worry you don't have to, just tell me and i'll shut up :angel: |
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| fdegrove |
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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| EC8010 |
| 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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