Search found 15710 matches

by Nick
Sun Mar 10, 2024 9:36 am
Forum: Everyones Projects
Topic: 6550 SE Amplifier
Replies: 110
Views: 9451

Re: 6550 SE Amplifier

can sit in an oil bath to exceed ratings. Exactly how much difference would that make? I would have expected that most of the heat from the anode was dissipated as IR (it being in a vacuum and all that) so how directly is the envelope temperature related to the max dissipation? I suppose it would a...
by Nick
Thu Mar 07, 2024 10:45 am
Forum: News
Topic: Paul Messenger
Replies: 2
Views: 479

Paul Messenger

Will be missed, One of the good ones.

by Nick
Thu Mar 07, 2024 10:24 am
Forum: Everyones Projects
Topic: 6550 SE Amplifier
Replies: 110
Views: 9451

Re: 6550 SE Amplifier

Thorston always was one for his brand. And trying to add a bit of woo by claiming that electrons have no reality is typical of that. The Standard Model may have a view on that :-)

I am with him with the no such thing as ground though :-)
by Nick
Tue Mar 05, 2024 10:58 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 32601

Re: OK…so I’m on wi’ summat

I have to be careful here as I have gone over to the dark side now, but I think that the preference for small caps in valve amps has two attractions. First, as Paul mentioned, taking the LF down too far just highlights the lack of flux in the output transformer, Secondly, if you have solved the flux...
by Nick
Mon Mar 04, 2024 12:35 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 32601

Re: OK…so I’m on wi’ summat

Probably Dave or Paul Joppa referred to the fact that protecting the se transformer from too much bass results in better bass. I think the tank effect referred more to the parafeed cap resonating with the two inductors in parallel (choke load and parafeed transformer) so I suppose you see a resonan...
by Nick
Mon Mar 04, 2024 8:41 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 149
Views: 32601

Re: OK…so I’m on wi’ summat

I have not tried it with a output stage, but certainly with interstages, small cathode caps can work a little different than you would from those calc's. The fact that you have a inductive load instead of a resistive one can give you a small (though helpful) inductive peak at LF via the LC circuit c...
by Nick
Fri Mar 01, 2024 3:15 pm
Forum: Assorted Stuff
Topic: The Quackery Thread
Replies: 360
Views: 190499

Re: The Quackery Thread

have never yet been really cold. If you have never been, I can thoroughly recommend Iceland. Iceland's a doddle! Lovely as it is (we really like it), it's not that cold... Try spending a winter in Newfoundland and Labrador - we hit -40C (before windchill) in Labrador which I remember well as it's t...
by Nick
Fri Mar 01, 2024 2:24 pm
Forum: Assorted Stuff
Topic: The Quackery Thread
Replies: 360
Views: 190499

Re: The Quackery Thread

have never yet been really cold.
If you have never been, I can thoroughly recommend Iceland.
by Nick
Fri Mar 01, 2024 8:50 am
Forum: Everyones Projects
Topic: 6550 SE Amplifier
Replies: 110
Views: 9451

Re: 6550 SE Amplifier

Benefits are broken and so is the NHS.
Instead of looking at whats broken, point your gaze at the ones that broke it.
by Nick
Tue Feb 27, 2024 11:09 pm
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 6888

Re: Audiojumble 03/03/24

What an interesting valve. A one socket push pull output stage.
by Nick
Sun Feb 25, 2024 4:05 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 82323

Re: C3g Aikido Phono

I would check the frequency response. 470u and 10r is at 33hz -3dB
by Nick
Fri Feb 23, 2024 9:41 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 82323

Re: C3g Aikido Phono

I have a phono stage PCB with a transistor socket for the jfet. Just sort by the anode voltage on the ECC88 on top of the fet. I have found that that single measurement is good enough to sort by op point in the phono stage and gain is directly correlated to that voltage.
by Nick
Fri Feb 23, 2024 2:27 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 82323

Re: C3g Aikido Phono

Don't know, the ones I sent are not matched in any way other than they are outside (on one side) the range of values that I want to use in my phono stage, but that's just to allow simple "build and it just works", So they will be closer matched than just buying a bag from the makers. 2 or ...
by Nick
Fri Feb 23, 2024 10:36 am
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 82323

Re: C3g Aikido Phono

I think I confused source and drain. Sorry about that.
by Nick
Fri Feb 23, 2024 10:34 am
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 82323

Re: C3g Aikido Phono

Not sure I understand the problem. Something like this: