Search found 20148 matches
- Thu Mar 21, 2024 9:04 pm
- Forum: News
- Topic: Steve Harley death: Cockney Rebel singer dies at 73
- Replies: 1
- Views: 370
Re: Steve Harley death: Cockney Rebel singer dies at 73
Only just seen this, damn.
- Sat Mar 16, 2024 10:08 pm
- Forum: Everyones Projects
- Topic: OK…so I’m on wi’ summat
- Replies: 149
- Views: 32630
Re: OK…so I’m on wi’ summat
Absolutely fab.
- Sat Mar 16, 2024 10:04 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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...
- Sat Mar 16, 2024 8:06 pm
- Forum: Assorted Stuff
- Topic: Owston 2024?
- Replies: 2
- Views: 298
Re: Owston 2024?
I am also interested. Almost guaranteed MCRU would be as well.
- Sat Mar 16, 2024 8:04 pm
- Forum: Assorted Stuff
- Topic: General health matters.
- Replies: 784
- Views: 191022
Re: General health matters.
Ah the pressure tester thing! It is impossible not to blink.
- Sat Mar 16, 2024 3:36 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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...
- Sat Mar 16, 2024 3:29 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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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Noise plot, it is what it is...
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Clipping with 2V peak input. No unexpected behaviour...
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- Sat Mar 16, 2024 3:25 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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...
- Sat Mar 16, 2024 3:13 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
Definitely got that going on hasn't it? This is a bit too new, let's go with what we know ...
- Sat Mar 16, 2024 10:19 am
- Forum: Jokes
- Topic: A little light humour
- Replies: 2698
- Views: 1175086
- Sat Mar 16, 2024 10:12 am
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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...
- Fri Mar 15, 2024 8:44 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
Ah found a picture ...
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- Fri Mar 15, 2024 8:36 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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!...
- Fri Mar 15, 2024 8:30 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
- Fri Mar 15, 2024 8:29 pm
- Forum: Solid State
- Topic: Germanium Amplifier
- Replies: 162
- Views: 81077
Re: Germanium Amplifier
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 ...