Thread: Sinclair mtv1
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Old 11-09-2017, 06:08 PM
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timmy timmy is offline
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Quote:
Originally Posted by jr_tech View Post
This is what I believe is one of the varactor tuning diodes in the Sinclair MTV-1 VHF tuner section (pictured above)... it is in a TO-92 style case with no markings on the flat side, just 3 color bands on the back. (I painted the red on the top for identification in my previous post)



Apparently the tuning voltage in the set can go as high as 31 volts.

Identification and/or substitution recommendations needed.

Thanks,
jr

.
Yes your right according to the fellow in England working on this set said in the posts that he too identified those varicaps and could not find replacements and did note that they had 3 colors just as you said. If we had a real schematic that may show values of sorts it may help but it's looking like a dead end for me. Looking at your pic there is green on the components and if that's moved it will probably break off as one of the pin diodes I took out one leg broke but it believe it tested leaking and they are available so that's not a problem . Would you know by the schematic what I possibly burned that killed the brightness and brought down the 45v to 26 volts.
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