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#1
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Silvertone R2R buzzing like a hornets nest
Got a Silvertone reel to reel that is buzzing LOUD. Even if the volume
is turned all the way down. 6EM7, 6EU7, 6AV6, 6X4. There are only two big capacitors inside. A big ol' 40mf 300V yellow paper cap. And a 30mf 300V metal can cap. Neither one shows any juice when I meter them after powering off. Just an edjamacated guess says that one of these two (or both) is the culprit. What do you guys think? |
#3
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Yup. Replace 'em both. Also replace all of the other wax caps. |
#4
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strat alot wrote:
Got a Silvertone reel to reel that is buzzing LOUD. Even if the volume is turned all the way down. 6EM7, 6EU7, 6AV6, 6X4. There are only two big capacitors inside. A big ol' 40mf 300V yellow paper cap. And a 30mf 300V metal can cap. Neither one shows any juice when I meter them after powering off. Just an edjamacated guess says that one of these two (or both) is the culprit. What do you guys think? That is caused by crotch crickets, just during the time while the sun crosses the equator on the way north. It will go away in six months. Smiles a lot!! John Stewart |
#5
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hey, thanks all. i set a bug bomb off in it last night to kill the
crickets 'cause i ain't waiting 6 months. i think i'll see what happens when i change the two (coupling? izzat what they are?) caps first. then go for the wax ones. there's alot of those little buggers. and i'm good at getting burnt. (i should probably change my tag to burnt-alot) the silver can cap's polarity is marked on the pc board. but big yeller isn't marked for polarity. there are two wires coming out of it : a red one and a yellow. can i safely assume that red is positive? the red one goes over to a juction that also connects to pin 6 on the EM87. The yellow one goes to a pc board (ground?). |
#6
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#7
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Thanks Sander,
I think i'm wrong about them being coupling caps though. They must be filter caps. http://www.justradios.com/safetytips.html |
#8
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#9
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Man I'm glad you said that.
I looked again and sure enough, there is a black ground wire too. Here is the cap in question : http://community-2.webtv.net/strat-alot/DoubleCap/ Now what do I do? Put in 2 separate caps? Will a couple of 47mf be good enough? |
#10
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(strat alot) said:
Man I'm glad you said that. I looked again and sure enough, there is a black ground wire too. Here is the cap in question : http://community-2.webtv.net/strat-alot/DoubleCap/ Now what do I do? Put in 2 separate caps? Will a couple of 47mf be good enough? JJ has a double 47 uF/400(450?) V type in their range, should even fit in the original space. -- Sander de Waal " SOA of a KT88? Sufficient. " |
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