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Reviews For: Heintz-Kaufman 811A Gammatron

Category: Electron Tubes

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Review Summary For : Heintz-Kaufman 811A Gammatron
Reviews: 2MSRP: None.
Description:
Reference- Higher gain than new manufactures today!
Product is not in production
More Info: http://
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0024.5
KM1H Rating: 2019-07-02
Product not produced for decades Time Owned: more than 12 months.
Review is misleading about availability otherwise good tubes subject to vacuum integrity.
JAMES_BENEDICT_EX_N8FVJ Rating: 2001-01-07
Very High Gain! Time Owned: 0 to 3 months.
As a reference I tested the H&K on a Hickok model #752 Gm type tube tester. I also referenced a new Cetron JAN 811A.
H&K
6.3 volts filament- 1450 mhos
5.0 volts filament- 1350 mhos
4.3 volts filament- 1150 mhos
3.0 volts filament- 750 mhos
CETRON
6.3 volts filament- 1100 mhos
5.0 volts filament- 900 mhos
4.3 volts filament- 700 mhos
3.0 volts filament- 450 mhos

Although the H&K tube has higher gain over the Cetron, this does not indicate the H&K will have longer life. This reference is not scientific by any means, just interesting. I am quite pleased with the performance of Cetron 811As and are very welcome in my amplifiers, especially so after Svetlana dropped production of the 811A.