Seeburg V amp motorboating (oscillating)

I have a Seeburg V amp that when you put in both 6L6's it starts
oscillating but it will work with either tube alone. I replaced the
output transformer with a Hammond 1645 and recapped it. It had a
couple of bad resistors in the output circuit (590K and 270K).

pinball scribbled;

"pinball" wrote in message
...
I have a Seeburg V amp that when you put in both 6L6's it starts
oscillating but it will work with either tube alone. I replaced the
output transformer with a Hammond 1645 and recapped it. It had a
couple of bad resistors in the output circuit (590K and 270K).

Try reversing the plate and screen conections to invert the phase
..............GC

Thanks, it did the trick,
Pinball Paul

On Fri, 02 May 2008 01:00:52 GMT, "E M F"
wrote:

pinball scribbled;

"pinball" wrote in message
.. .
I have a Seeburg V amp that when you put in both 6L6's it starts
oscillating but it will work with either tube alone. I replaced the
output transformer with a Hammond 1645 and recapped it. It had a
couple of bad resistors in the output circuit (590K and 270K).

Try reversing the plate and screen conections to invert the phase
..............GC

pinball wrote:
Thanks, it did the trick,
Pinball Paul

On Fri, 02 May 2008 01:00:52 GMT, "E M F"
wrote:

pinball scribbled;
"pinball" wrote in message
...
I have a Seeburg V amp that when you put in both 6L6's it starts
oscillating but it will work with either tube alone. I replaced the
output transformer with a Hammond 1645 and recapped it. It had a
couple of bad resistors in the output circuit (590K and 270K).

Try reversing the plate and screen conections to invert the phase
..............GC

Is you old output transformer shorted or open? If shorted I would like
to 'borrow' it for making an incircuit transformer tester. Open is easy
to test and of no interest for my test design.

LMK.

John :-#)#

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