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Reviews Categories | Electron Tubes | Russian GU74B Tetrode Help

Reviews Summary for Russian GU74B Tetrode
Reviews: 2 Average rating: 5.0/5 MSRP: $(missing—add MSRP)
Description: Russian GU74B Tetrode NOS
Product is not in production.
More info: http://
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K5DSQ Rating: 5/5 Dec 2, 2017 10:25 Send this review to a friend
Excellent Tube!!  Time owned: more than 12 months
Excellent tubes that run in an excellent amp (Alpha ETO 91b)! Very hard to beat these workhorses, especially for the price.
MM0IMC Rating: 5/5 Nov 28, 2017 01:13 Send this review to a friend
Wow!  Time owned: more than 12 months
I bought this Soviet era NOS GU74B tetrode from Ukraine about two years ago, with a date code of August 1977 stamped on it. It was a spare for my new Alpin 100 mk3 at the time of purchase.

I had it in store and decided to test it against the GU74B that came with the amplifier (1983 date stamped on it). I conditioned it for about five hours with just the heater voltage applied.

It give me the same power out as the original GU74B did, stunning for a forty year old valve (tube)! Easily 1.3kW+ on HF and 1kW on 6m into a large oil can dummy load!

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