"Wally" wrote in message
...
Keith G wrote:

V1 = 0.317 V / 10.2 ohms (10R2 ??)
V2 = 0.303 V / 10.0
V3 = 0.322 V / 10.2
V4 = 0.318 V / 10.5

If you adjust the tweakers so that the voltages measure as follows...

V1 = 0.3162V
V2 = 0.31V
V3 = 0.3162V
V4 = 0.3255V

...that should give each valve an Ia of 31mA. I'm assuming that the 31mA
on
the valve label indicates what the anode current should be for all valves.
(Do they all have the sticker, and do they all have the same value for
Ia?)


This getting very interesting. Yes, all 4 valves have the same sticker with
the same values, but I have seen diffent values (33, not 31) on the labels
on the eBay pic. I have another identical amp coming in a couple of days
(hopefully) and it will be interesting to see what the values are on that
one.

It almost looks like they measure every valve and match them - is this
likely or is it ********???

OK, I see one or two more posts coming in - I gotta go (or I'll get a
slappin') I'll get back on this tomorrow - many thanks to all, it's
interesting and extremely useful. (It's either *me* now or Phil North in a
few days when he get his 'identical' amp!! ;-)

Rock on....