STV-4H diode

C

calman46

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May 9, 2012
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158
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MA
Do these diode get "leaky" ? On a restored SX 980 one diode will bring the idle current to 6mV but other diode it will go down to 20mV. Its the diode I swap them around. I can set the bias and it appears to hold when testing .I wondering if the diode is on verge of failing . No replies at AK . Thanks
 
I just had an STV-3H with one diode shorted internally. The symptom was no bias on that channel. The STV-4H has 4 series connected diodes inside. Rather than leaky, it probably has the same failure as mine.
 
nakdoc said:
I just had an STV-3H with one diode shorted internally. The symptom was no bias on that channel. The STV-4H has 4 series connected diodes inside. Rather than leaky, it probably has the same failure as mine.
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I just installed a new set of STV-3H in a Sansui.... They were toast. The brittle wire on the other one snapped up next to the body..... Hell of an invention eh???
 
Thanks, kinda pricey. The last ones I bought were in Germany 8 years ago for 6 bucks ...the Spec 2 would be grounded without the STV-4H...
 
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WOPL Sniffer said:
I'll get back to you on the 220V

Some had the correct transformer to make it 220 but when we were over seas, we just used a wall transformer which stepped down the 220 and made it 110..... They are cheap and don't require a rewire.
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OK, thanks.
M
 
If you have STV-2H, or 3H, add one or two diodes in series, and you'll have a 4H. 1S1555 or 1N4148. I have a bunch of 2H diodes here.
 
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