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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). |
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Seeburg V amp motorboating (oscillating)
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 |
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Seeburg V amp motorboating (oscillating)
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 |
#4
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Seeburg V amp motorboating (oscillating)
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 :-#)# -- (Please post followups or tech inquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
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