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Old 9th December 2008, 09:29 PM   #1
nhuwar is offline nhuwar  United States
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Default 12hg7 vs 12hn7a

Hi all,

I'm looking at a amp that uses a 12hg7 as a driver, but all I can find is the 12hn7a. In you opinion is the 12hn7a a good tube for audio?

Thanks for the help,


Nick
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Old 9th December 2008, 10:22 PM   #2
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Do you mean 12GN7? The 12HG7 and 12GN7 are considered equivalent and many were marked with both numbers. The 12HG7 was often found in the large (1 1/8") bottle - 12HG7 is usually the standard 9-pin size.
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Old 9th December 2008, 10:26 PM   #3
nhuwar is offline nhuwar  United States
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OOps typo, Ya I might the 12gn7. As far as I could tell by the data sheets they looked pretty much the same, just wanted to ask though.

Thanks Tom



Nick
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Old 10th December 2008, 02:26 PM   #4
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I'm using the 12HG7/12GN7 as a substitute for the pricy 12BY7A, configured as a triode for driver. The GE spec sheet shows gain in triode practically double to other tubes. Both are good high gm line video tubes specially for the old TV and broadcast markets. The slight drawback of the 12GN7 is the high g1 capacitance and limitation to input volts and no attention to microphony. They aren't screened and will readily self oscillate with bad layouts.
The sibling european EF184 is smaller, screened and plentiful.

rich
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Old 10th December 2008, 07:44 PM   #5
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Pete Millet used a 12hg7 to drive 813 in 2 stages if thats any help. Google should find it, or failing that if you mail me I will send you circuits.

Ed
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Old 10th December 2008, 08:11 PM   #6
nhuwar is offline nhuwar  United States
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Quote:
Originally posted by vitalstates
Pete Millet used a 12hg7 to drive 813 in 2 stages if thats any help. Google should find it, or failing that if you mail me I will send you circuits.

Ed

Thats what I'm building LOL

Nick
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Old 12th December 2008, 05:21 PM   #7
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Quote:
Originally posted by nhuwar



Thats what I'm building LOL

Nick
I've used them as drivers in PP for 813 and they were excellent.
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