audio-talk

Even without the 1.414/0.9 = 1.57 excess voltage, I was thinking more about the cold start condition of the ECC88 that will see the entire B+ on its anode until it starts to pass current.

Would need at least a 5W zener, but yes I guess so. But remember Max, adding some solid state may cause all manner of demons to fly out :-). A potential divider before the first stage would do the job, a 88 doesn't need a 80k load resistor, especially if its got a choke in there as well. Or just lea...

Just a couple of thought, you are never going to be able to use much in the way of negative feedback in that amp (at least by comparison with a modern direct coupled circuit. That interstage is going to add so much group delay and general phase shifting nastyness that the most you can manage is PP v...

They are your valves, so up to you. I manually turn heater supplies up then b+. Two outputs on the variac, all heaters first, then b+. I always assume a unexpected short term power outage could happen, so I either make sure that the startup control is automatic, or not needed. The chokes arent inste...

Just remember the max anode voltage (cold) of a ecc88 is 550v.

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...

Will be missed, One of the good ones.

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

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...

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...

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...

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...

have never yet been really cold.

If you have never been, I can thoroughly recommend Iceland.

Benefits are broken and so is the NHS.

Instead of looking at whats broken, point your gaze at the ones that broke it.

What an interesting valve. A one socket push pull output stage.