hi all...
i came across about 65x tung-sol 7236 tubes, about 30 of each metal base and plastic base. i don't know much about tubes and have a couple questions...
1) is there a high demand for these tubes? what do they go for if tested good?
2) how might I go about testing them? i have a B&K 747 tester but they aren't on the chart. i've heard that they are a drop-in replacement for a 6080, could I just test using those settings?
thank you!!
i came across about 65x tung-sol 7236 tubes, about 30 of each metal base and plastic base. i don't know much about tubes and have a couple questions...
1) is there a high demand for these tubes? what do they go for if tested good?
2) how might I go about testing them? i have a B&K 747 tester but they aren't on the chart. i've heard that they are a drop-in replacement for a 6080, could I just test using those settings?
thank you!!
The 7236 is an old series pass tube for power supplies. Very old computers like the Univac used them. They are not drop in replacements for the 6080. They have a higher amplification factor then the 6080, but less then the 5998. Could probably test as 5998 with some derating and get some idea of matched sides. Sometimes used as OTL output stages. Look to eBay for prices. They're all over the place depending on the fool of the day. Pin out is the same for all three.
6080 - Amp Factor 2 - Transcond. 7000 µmhos
7236 - Amp Factor 4.8 - Transcond. 12,500 µmohs
5998 - Amp Factor 5.4 - Transcond. 15,500 µmohs
6080 - Amp Factor 2 - Transcond. 7000 µmhos
7236 - Amp Factor 4.8 - Transcond. 12,500 µmohs
5998 - Amp Factor 5.4 - Transcond. 15,500 µmohs
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I use 7236 tubes in a commercial OTL headphone amp. I pay $35 each from a large tube vendor, so I'd say that is what they're worth.
They are pretty good audio tubes for certain applications. They are similar to a 5998, but you need to be careful with heater-cathode insulation - it is wimpy. This tube was used as a motor driver for early computer tape drives instead of a pass tube so it had no need for a highly elevated cathode.
They can be used in SE and PP output stages, though I've found other tubes (like triode connected EL34) to work better.
They are pretty good audio tubes for certain applications. They are similar to a 5998, but you need to be careful with heater-cathode insulation - it is wimpy. This tube was used as a motor driver for early computer tape drives instead of a pass tube so it had no need for a highly elevated cathode.
They can be used in SE and PP output stages, though I've found other tubes (like triode connected EL34) to work better.
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