STV-4H diode

calman46

Journeyman
Joined
May 9, 2012
Messages
124
Location
MA
#1
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
 

nakdoc

Journeyman
Joined
May 11, 2011
Messages
443
Location
Nashville, TN Music City
Tagline
highly biased
#2
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.
 

WOPL Sniffer

Veteran and General Yakker
Joined
Aug 10, 2015
Messages
5,568
Location
Arizona
Tagline
Screw it
#3
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.

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???
 
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