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Reviews For: Russian GI-7B

Category: Electron Tubes

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Review Summary For : Russian GI-7B
Reviews: 3MSRP: 32.50
Description:
HF-VHF-UHF Coaxial Triode. With 350w anode dissapation.
NOS available in abundance.
Product is not in production
More Info: http://www.GI-7B.com
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0035
N9TSL Rating: 2020-12-19
Great Time Owned: more than 12 months.
I converted a Dentron GLA-1000B to use a GI-7BT about 18 months ago and it has been rock solid. It will output as much as 500 watts on 20m but I keep output down to 400 and it hasn’t given me a minutes worth of trouble. It’s apparently a pretty rugged tube because one time I forgot to turn the drive power down on my rig and hit it with 100 watts drive (normal is 20 watts) and it blew the line fuse. I was worried that I hurt it but after replacing the fuse it works just as good as before. At only $25-30 each they’re dirt cheap compared to most comparable tubes
W9DZ Rating: 2012-01-19
A terrific bargain Time Owned: 6 to 12 months.
I am using the tropical version of this tube, the GI7BT, in a home brew 6M amp. I paid less than $28 each including shipping from Ukraine. Using a single tube I'm getting over 400W out with 22W of drive. It's been on the air 6 months now and has been very stable. I also use it as an AM linear at 100W of carrier. The tubes require conditioning before use as most have been in storage 20 to 30 years. Plenty of info available on the Internet.
KW3KW Rating: 2010-09-05
Nice Gain Time Owned: 0 to 3 months.
So far the GI-7B has proved to be a great tube.
The replacements are NOS, and available in abundance via the internet at reasonable $/watt prices. For a few $ more, a robust version is available, the GI-7BT designed for tropical climates of high temperature and humidity. Power multiplication factors of 10x to 14x can be expected with 40-60w drive. RFI/TVI has proven to be nil in my application of converted Dentron
GLA-1000B.