S meter problem

[Multi-Volti Devices]

Another interesting 6AU6 trivia bit from Heath...There were some Soviet
'6AU6's' being purchased at one point in the early 90's. They were way
too tall, probably 1/2" or more. They worked fine everywhere but the
elevated sockets, like the vfo. (The lid wouldn't close!).

Occasionally we'd get a letter in service from a customer who was angry
over the use of 'Communist' tubes from USSR, but that's where
International Servicemaster was getting them from...not much choice in
the US at the time. I showed the tech next to me, jokingly, the solution
to that 'problem'...as I scratched the SR of the end of USSR....but I
didn't ship any that way...that tube went in the test bench unit! :o)

Murray


Ed Mosher wrote:

> The drifting "S" meter is usually due to the 6AU6 at V3.  There was a
> time when Heath recieved some defective 6AU6's from it's supplier.
> Turns
> out they had 4-volt filaments in them, thus producing excess
> emissions!
> Try swapping the tube in V3 with one of the other 6AU6's, or a new
> tube
> if one is available.
>
> Ed Mosher
> WA8ZVO at JUNO.COM         Formerly  "One of the Hams at Heath"
>   "Corporations make decisions based on dollars, not SENSE!"
>
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