audio-talk

I have flitted like a butterfly onto Bantam stuff, if possibly briefly... Decided it would be easier to start working on the engine in the conservatory, the shed is too cramped, too dark, too cold in winter and too hot in summer (mind you the two latter are also true of the conservatory, but it wins...

Only just seen this, very sorry Phil.

Only just seen this, damn.

Absolutely fab.

With improved output transistor biasing - originally thermistors were added for safety, they basically went across the transformer secondaries, because the DC resistances of same formed part of the resistor divider that biases each o/p transistor, as per the Burns-Orbit. The original thermistors are...

I am also interested. Almost guaranteed MCRU would be as well.

Ah the pressure tester thing! It is impossible not to blink.

First 30 seconds of a WAV file - Life Is A Long Song by Jethro Tull..... :D - Germanium amp 2024-C4-wav.png - I had the EP of this when it first came out, so 1971-ish, ad often used it as a 'test signal' for whatever I was building at the time. Not an ideal choice to be honest, and caused a bit of h...

Frequency sweep, checks out OK...
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Noise plot, it is what it is...
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Clipping with 2V peak input. No unexpected behaviour...
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Alright, so then I found this fabulous thing - it's another one from the school exercise book... this is Fig 10.38 from the original library book... - Fig1028.jpg - They are taking the NFB back to the driver stage emitter, so I tried that... first I did what you suggested, take it back to base, that...

Definitely got that going on hasn't it? This is a bit too new, let's go with what we know ...

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But I wonder if its worth trying a NPN for Q1 and taking the feedback back to Q1's base. Oh wait, sorry I misunderstood - forgot where 'Q1' was - I know what you mean now - I shall have a ponder..... back shortly ... "I have a cunning plan my lord" http://livinginthepast-audioweb.co.uk/im...

Ah found a picture ...
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This is cobblers and do this better is my kind of self-encouragement! :lol: I was part-paid (aka "take them please before I dump them on eBay") for a repair job a while back in a few OC35s! Matched pairs apparently back in the 60s or 70s and stored in these polystyrene boxes. Shiny shiny!...