14 Jun
2005
14 Jun
'05
11:04 p.m.
At 00:26 15/06/2005, you wrote:
So close, but a typo loses the point! It was the 3/4 and 1-1/8 that threw
me - I was building a 5/20 variant one time and needed those cutters. I
reckon the 5/8 was for a fuseholder.
I've transcribed the Mullard book to CD.
Richard
At 00:29 04/06/2005, you wrote:
Close, but no cigar :-)
The 5-10 (5 valves 10 watts) used an EF86, ECC83, 2 off EL84 and an EZ81.
All are on B9A bases, so I'd only have needed the 3/4" punch. I can't
remember the hole size for the Bulgin plugs used for the mains and
speaker connections, but I think it was smaller than 1+1/8".
Now, had you said the 5-20 (line up : EF86, ECC83, 2 off EL34, GZ32),
then I would have needed the 3/4" and 1+1/8". And had I also been
building the companion FM tuner, I would have needed the 5/8" (for the
EB91 detector double diode, I think the B8A 'rimlock' sockets for the
EF41s would go in a 3/4" hole).
Yes, I do have the appropriate Mullard books. And the Williamson
reprints. And the GEC book on audio amplifiers (which starts with the
Williamson and goes on to a monster with a rated 1.1kW audio output power). They're a bit like the good old Q-max cutters
(now that is showing my age
[1]).
[1] The first 3 I ever bought, over 25 years ago, were 5/8", 3/4" and
1+1/8". Why?
-tony
You were building a Mullard 5/10 valve (tube) amp!