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In Reply to: RE: Any dual, hi mu triode.... posted by grhughes on May 25, 2012 at 09:24:45
Thanks! Do you recommend an affordable tube tester?
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Look for a Weston 981 Type III or a Heathkit TT1. They both were designed by the same engineers. Weston and Heathkit were owned by the same company. The Eico 666 and 667 are also nice if they have been taken care of. Just don't buy an emission tester and insist on a transconductance tester with a built in oscillator that applies a signal to the grid of the tube. Testers this old are gona need some repair or rejuvenation like replacing electrolytic caps and maybe a few worn out tube sockets so get yourself psyched up for that. Ray
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)
I use a Hickok and BK 747 which is a SS tester and very good for a simple reliable emissions style tester. There are usually some for sale on e-bay for less than the tubed transconductance models. I think they also claim transconductance but I don't think any one uses them for that.
Steve
B&K 747s are NOT just emissions testers, they are true transconductance testers. They just don't give you a readout in umhos, they give it as a figure on an arbitrary scale.
I use mine for Gm all the time - the 747 will test a lot of tubes that older testers won't.
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