Search found 20199 matches

by Mike H
Sat Mar 16, 2024 10:19 am
Forum: Jokes
Topic: A little light humour
Replies: 2717
Views: 1238866

Re: A little light humour

:D




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In case of fire air horn.jpg
In case of fire air horn.jpg (62.39 KiB) Viewed 5230 times
by Mike H
Sat Mar 16, 2024 10:12 am
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

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...
by Mike H
Fri Mar 15, 2024 8:44 pm
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

Re: Germanium Amplifier

Ah found a picture ...
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cv7084_box.jpg
cv7084_box.jpg (47.95 KiB) Viewed 2063 times
by Mike H
Fri Mar 15, 2024 8:36 pm
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

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!...
by Mike H
Fri Mar 15, 2024 8:30 pm
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

Re: Germanium Amplifier

Ray P wrote: Mon Mar 11, 2024 7:32 pm Warmer weather is on the way Mike, soon be working on your geranium amplifier...
As usual, the last few days I've been down a different rabbit hole...
by Mike H
Fri Mar 15, 2024 8:29 pm
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

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 ...
by Mike H
Fri Mar 15, 2024 8:19 pm
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

Re: Germanium Amplifier

andrew Ivimey wrote: Sat Mar 09, 2024 7:32 am PNP oc35s ( never heard of them) I always thought oc28s were the swanky ones!

I'd like to hear them.
And these are ex-RAF military ones, so even swankier. :D
by Mike H
Fri Mar 15, 2024 8:12 pm
Forum: Beginners
Topic: Pot Impedance
Replies: 3
Views: 2550

Re: Pot Impedance

I concur with Nick.

I even use 100k pots on transistor amp front-ends (with large value bias resistors for the first stage) just in case the source clutches its pearl necklace and faints if presented with anything much lower
:lol:
by Mike H
Fri Mar 15, 2024 8:03 pm
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 195
Views: 47872

Re: OK…so I’m on wi’ summat

Nice Steve. Does aluminium work-harden at all or can it be bent "in one"? It does work harden so you probably have only the one chance to get it right. Steel is more forgiving but harder to get moving in the first place. Copper would be a brilliant option for bending. My experience has be...
by Mike H
Fri Mar 15, 2024 7:56 pm
Forum: Everyones Projects
Topic: 6550 SE Amplifier
Replies: 110
Views: 13651

Re: 6550 SE Amplifier

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. I had exactly one of these yesterday - Western Power have been 'fiddling about' with the underground network over the road for weeks, but this was the first...
by Mike H
Sat Mar 09, 2024 2:17 am
Forum: Solid State
Topic: Germanium Amplifier
Replies: 162
Views: 86551

Germanium Amp Revisited

Germanium Amp Revisited This below ... wow it's now 12 years old! 12 years ago I made this... - Germanium Amp 2024-01.jpg - It's been to Owston a couple of times and got at least one or two favourable comments as I remember. However it always had a few issues. I was looking at it again recently (for...
by Mike H
Sat Mar 09, 2024 1:36 am
Forum: Everyones Projects
Topic: On My Bench.
Replies: 93
Views: 33770

Re: On My Bench.

Re the PSU, wow what a story. :lol:
by Mike H
Sat Mar 09, 2024 1:21 am
Forum: Everyones Projects
Topic: OK…so I’m on wi’ summat
Replies: 195
Views: 47872

Re: OK…so I’m on wi’ summat

I like it! :thumbright:
by Mike H
Fri Mar 01, 2024 11:58 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16520
Views: 4897793

Re: Nothing In Particular

andrew Ivimey wrote: Thu Feb 29, 2024 9:00 pm Yep but worth it!
It's giving me lots of pies to scoff, if that's what you mean. :lol:
by Mike H
Thu Feb 29, 2024 8:55 pm
Forum: Everyones Projects
Topic: On My Bench.
Replies: 93
Views: 33770

Re: On My Bench.

simon wrote: Wed Feb 28, 2024 8:13 am Hey, it wasn't obvious on my phone! Honest! And my attention was drawn to Dave's tidy manicure which appeared to me to be pointing at the two soldered joints!
Sorry, that was me seeing it for the first time as well, after you. :D

Not a criticism.