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turk 182 17th February 2013 03:02 PM

heathkit t3 12sh7 tube
does anyone know if there's any source/supply of 12sh7 tubes other than cannibalizing old units or maybe a swap or easy mod to something more common for this device as used in a Heathkit T3 Visual Aural signal tracer.

Mickeystan 17th February 2013 03:05 PM

There is a large quantity of them available on ebay.


turk 182 17th February 2013 04:32 PM

i guess i'm leaning toward modding it.
ebay makes me nervous.

the_manta 17th February 2013 04:51 PM

Nearly every tube store/shop has them. Please leave it in its original condition

JonSnell Electronic 17th February 2013 07:52 PM

12SH7, Tube 12SH7; Röhre 12SH7 ID5441, Vacuum Pentode

turk 182 17th February 2013 09:36 PM

i can't seem to find them here in north america ontario canada to be more specific

Tom Bavis 18th February 2013 12:17 AM

My list says I have eight new or tested ones - probably more in the boxes of untested metal tubes...

The more common 12SJ7 will work, but you'll probably have to jumper pin 3 to pin 5 (connected internally in the 12SH7)

turk 182 18th February 2013 12:45 AM

thanks tom
i knew there was a similar type but my old sylvania cross doesn't even list the 12SH7
how much for a couple from your inventory?

Tom Bavis 18th February 2013 01:17 AM

PM sent

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