Hi all,
I have a nice little E55L spud which I am very happy with, but as a challenge (and in order to use some input transformers I have) I have a hankering for a real PP spud amp. I have been seeking through just about all the twin triode's and twin tetrodes looking for candidates.
The requirement would have to be a single bottle per side but otherwise anything goes.
The best candidates I have come up with so far are:
5687 - simple and elegant but really a bit anemic even for my frugal needs
ECC99 - still a bit anemic
6N30p - beefier but lacking the necessary mu to go it alone (diyaudioprojects.com/mirror/members.aol.com/sbench101/)
QQV04-16 gain a bit low, gm a bit marginal at 10.5mA/V
QQV02 -6 gain a bit better, gm a bit marginal at 10.5mA/V
So am I missing something, are there better candidates.
I need to dig deep into the Compactron .lists, but it strikes me that they rarely have beefy enough triodes and they are often badly mismatched by design.
Shoog
I have a nice little E55L spud which I am very happy with, but as a challenge (and in order to use some input transformers I have) I have a hankering for a real PP spud amp. I have been seeking through just about all the twin triode's and twin tetrodes looking for candidates.
The requirement would have to be a single bottle per side but otherwise anything goes.
The best candidates I have come up with so far are:
5687 - simple and elegant but really a bit anemic even for my frugal needs
ECC99 - still a bit anemic
6N30p - beefier but lacking the necessary mu to go it alone (diyaudioprojects.com/mirror/members.aol.com/sbench101/)
QQV04-16 gain a bit low, gm a bit marginal at 10.5mA/V
QQV02 -6 gain a bit better, gm a bit marginal at 10.5mA/V
So am I missing something, are there better candidates.
I need to dig deep into the Compactron .lists, but it strikes me that they rarely have beefy enough triodes and they are often badly mismatched by design.
Shoog
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If a man hasn't got principles - what has he got.
The reality is that the last thing I need at the moment is another amp cluttering up the place (and annoying the long suffering wife) so unless it has that special magic quality it ain't worth building. For me the last frontier is a single bottle PP spud - everything else has been achieved.
Shoog
The reality is that the last thing I need at the moment is another amp cluttering up the place (and annoying the long suffering wife) so unless it has that special magic quality it ain't worth building. For me the last frontier is a single bottle PP spud - everything else has been achieved.
Shoog
A very good one:
Audiyofan.org • Afficher le sujet - SPUD PP 6s45p V2 – Pben – ‘Albatre Ligne Etigues’
Schemos are internationals !
The author or myself may help if needed.
Yves.
Audiyofan.org • Afficher le sujet - SPUD PP 6s45p V2 – Pben – ‘Albatre Ligne Etigues’
Schemos are internationals !
The author or myself may help if needed.
Yves.
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That looks really interesting, though there is no data on Transconductance and the mu looks decidedly inadequate for the task at hand. A step up transformer might solve that, but only if it had the transconductance necessary.
Seems it would need something like 14V Peak to Peak of drive to deliver at a usable bias point.
Shoog
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Both the QQV04-16 and QQV02-6 have more ideal characteristics. Ultimate power output is not that critical - 1-2Watts is adequate for my needs.
Shoog
im afraid this is true in many cases..
or wire as Shade(bump mu above 10), implementing input tx into fb.. phase splitting included for free
1:8 http://www.amtrans.co.jp/wp-content/uploads/2016/04/1922.pdf
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