I'm using the tweeked build and it will sound get for a while but I have lost 2 silver mica smoothing caps on pins 6 to 8. The caps are rated for 500v I have never had this problem before. Any thoughts?
BL
BTW the plate voltage at pin 6 is right at 200v
Keep loosing smoothing cap on OD tube
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- Blind Lemon
- Posts: 147
- Joined: Sat Nov 10, 2007 3:28 am
- Location: Okie
Re: Keep loosing smoothing cap on OD tube
there was a run of failing 500V silver mica caps over here in Germany about eighteen months ago. No one got to the bottom of it, but there was a consensus that you have to be really careful with the heat when soldering them now. A bit like with the Styroflex caps.
I prefer the older domino type of mica caps, if one can get the voltage rating.
Best, tony
I prefer the older domino type of mica caps, if one can get the voltage rating.
Best, tony
Re: Keep loosing smoothing cap on OD tube
First I heard of that, good to know.
Blind Lemon, how are you determining that they are going bad?
Blind Lemon, how are you determining that they are going bad?
Tom
Don't let that smoke out!
Don't let that smoke out!
- Blind Lemon
- Posts: 147
- Joined: Sat Nov 10, 2007 3:28 am
- Location: Okie
Re: Keep loosing smoothing cap on OD tube
Structo, They are leaking voltage. I can lift one leg and the channel comes back, found it by only having about 35v on the plate of that triode and the other side having normal ~200v on the plate. The OD channel was not workings, you can guess, happened 2 times in about a month.
Overtone, thanks for the heads up, I hate to throw these away but I can,t have this happening.
I'm going down to a local parts place today and see what they have in stock.
BL
Overtone, thanks for the heads up, I hate to throw these away but I can,t have this happening.
I'm going down to a local parts place today and see what they have in stock.
BL
Re: Keep loosing smoothing cap on OD tube
I'll have to check mine, because it seems my OD volume is down a bit.
Tom
Don't let that smoke out!
Don't let that smoke out!
- Blind Lemon
- Posts: 147
- Joined: Sat Nov 10, 2007 3:28 am
- Location: Okie
Re: Keep loosing smoothing cap on OD tube
Went and got some new ones this morning and letting it burn in for a couple of hours.
Will let you know.
BL
Will let you know.
BL
- Blind Lemon
- Posts: 147
- Joined: Sat Nov 10, 2007 3:28 am
- Location: Okie
Re: Keep loosing smoothing cap on OD tube
Cooked it for about 3hrs and played it for another 45min. Working good, hope that did it.
BL
BL