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Old 17th February 2013, 03:02 PM   #1
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Default 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.
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Old 17th February 2013, 03:05 PM   #2
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There is a large quantity of them available on ebay.

Mickeystan
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Old 17th February 2013, 04:32 PM   #3
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i guess i'm leaning toward modding it.
ebay makes me nervous.
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Old 17th February 2013, 04:51 PM   #4
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WTF....
Nearly every tube store/shop has them. Please leave it in its original condition
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Old 17th February 2013, 07:52 PM   #5
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12SH7, Tube 12SH7; Röhre 12SH7 ID5441, Vacuum Pentode
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Old 17th February 2013, 09:36 PM   #6
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i can't seem to find them here in north america ontario canada to be more specific
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Old 18th February 2013, 12:17 AM   #7
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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)
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Old 18th February 2013, 12:45 AM   #8
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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?
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Old 18th February 2013, 01:17 AM   #9
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