Search found 20148 matches

by Mike H
Tue Jan 30, 2024 8:23 pm
Forum: Everyones Projects
Topic: On My Bench.
Replies: 84
Views: 28775

Re: On My Bench.

The non-essential-but-oh-so-cool (IMO) 'tuning indicator' doesn't work on it though unfortunately, its a 6U5G.
Quite a few 6U5G on eBay at the moment, if it's actually the valve that's faulty.
by Mike H
Tue Jan 30, 2024 8:16 pm
Forum: Everyones Projects
Topic: On My Bench.
Replies: 84
Views: 28775

Re: On My Bench.

Phwoar! Jealous! :wink:
by Mike H
Mon Jan 29, 2024 6:30 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 176
Views: 85056

Re: Valve amplifier service

OK thanks. :thumbleft:
by Mike H
Sun Jan 28, 2024 9:39 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 176
Views: 85056

Re: Valve amplifier service

It was interesting to revisit this after a fair break. The hum is greater on the right channel than the left. Connected to 18" Fane drivers which will be around 97/98dB the right channel is low but audible. Back in the day, many of our amps hummed like this and we were quite pleased with them ...
by Mike H
Sun Jan 28, 2024 9:29 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 176
Views: 85056

Re: Valve amplifier service

Sorry I've lost track. Did Simon change any components? (@ Simon )
by Mike H
Sun Jan 28, 2024 9:14 pm
Forum: Everyones Projects
Topic: Pass Sony VFET Project
Replies: 21
Views: 3105

Re: Pass Sony VFET Project

Shocking innit? :lol:
by Mike H
Sun Jan 28, 2024 9:13 pm
Forum: Assorted Stuff
Topic: what are you doing ?
Replies: 1308
Views: 439696

Re: what are you doing ?

Wow! :shock:
by Mike H
Fri Jan 26, 2024 8:06 pm
Forum: Everyones Projects
Topic: On My Bench.
Replies: 84
Views: 28775

Re: On My Bench.

Wow toroids for radio coils. Well I guess, since there's a lot of them around nowadays.
by Mike H
Fri Jan 26, 2024 7:40 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 176
Views: 85056

Re: Valve amplifier service

I was wondering if it's noisy mains, being more noisy than normal. Whatever the normal is. :D
by Mike H
Fri Jan 26, 2024 7:36 pm
Forum: Everyones Projects
Topic: Side Projects
Replies: 108
Views: 52350

Re: Side Projects

Shucks guys. :oops: But ta muchly. :thumbleft: Appendix, trivia – Transformers are – #1. Vigortronix VTX-146-120-224, 120 VA, 2 x 24V @ 2.5A (main circuit supply) Wired as: 0 – 48VAC Fuse: inline, 2.5A Rectifier: GBJ 2510 (bridge, SIL) Reservoir cap Volts: 74V DC, no external load. #2. Vigortronix V...
by Mike H
Fri Jan 26, 2024 7:14 pm
Forum: Valves
Topic: Valve amplifier service
Replies: 176
Views: 85056

Re: Valve amplifier service

A sanity check is very important. :thumbleft:

:D
by Mike H
Thu Jan 25, 2024 6:40 pm
Forum: Everyones Projects
Topic: Side Projects
Replies: 108
Views: 52350

Re: Side Projects

Dave the bass wrote: Thu Jan 25, 2024 6:21 pm So you should be. Award yourself a can of Shandy Bass and packet of Prawn Cocktail flavour crisps for that one.

Impressed of Dartford. 😎
Oh jolly good idea old bean. I could go for that. :thumbleft:
by Mike H
Thu Jan 25, 2024 6:13 pm
Forum: Everyones Projects
Topic: Side Projects
Replies: 108
Views: 52350

Re: Side Projects

Thanks very much for that - yes I forgot to add, I am indeed very pleased with it. Should be a nice bit of kit now. Proper job! :thumbright:
by Mike H
Thu Jan 25, 2024 6:11 pm
Forum: Valves
Topic: PP3521 idht
Replies: 95
Views: 19792

Re: PP3521 idht

Nick wrote: Thu Jan 25, 2024 3:22 pm Why not use the primary of the interstage as anode chokes and cap couple to the grids?
I was thinking of doing this with the 801A's.

Done interstage, let's try the other.
by Mike H
Thu Jan 25, 2024 5:49 pm
Forum: Everyones Projects
Topic: Side Projects
Replies: 108
Views: 52350

Re: Side Projects

Might be my imagination, but it seems to work a lot better than ever before. If that's true, it's most likely because half of the component values are no longer cock-eyed. It's been on a few hours now - I made Voltage drift (warming up) about 2% - half a Volt at 25V. - Marconi-029.jpg - - Marconi-03...