EF86

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EF86

Postby TubeGetter on Sat Jun 16, 2001 12:21 am

Is this the noisiest tube of all time or what!!!!
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Re: EF86

Postby Highwaystar on Sat Jun 16, 2001 4:09 am

I can't hear it, could you turn your amp up?
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Re: EF86

Postby tabreaux on Sat Jun 16, 2001 7:02 pm

It shouldn't be noisy unless it is going bad.
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Re: EF86

Postby Ron Ott on Sat Jun 16, 2001 9:57 pm

<I>The EF86 is a great sounding tube.</I> It's a pentode and has more gain than the usual 12AX7. It was popular in Euro tube radios and hi fis, and you can still find great tubes for a reasonable price. They were used in the Matchless D/C-30. My new amp design has an EF86 as the lead channel pre, then straight to the phase inverter. Not noisy, but you gotta watch the gain control. I think Dr Z uses one in the Route 66 amp. :D<p>[ June 16, 2001: Message edited by: AmpManiac ]
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Re: EF86

Postby Kevin on Mon Jun 18, 2001 9:15 pm

I agree, noisy. When I had my Matchless (1st year of production), it originally came with an NOS EF86 which eventually gave out. The only replacement available at the time was a Russian model. Apparantly, there was some internal difference in that one of the pins was not connected or some such nonsense. Anyway, I went through a TON of EF86's only to find that the Matchless needed a mod to properly handle the new tubes. It was as simple as wiring one of the pins to the bus, if I recall correctly. <P>Anyway, it helped somewhat. Even after that, though, I went through all the EF86's I had purchased (about 20, I guess) and rated them for noise and microphonics. Most either had some noise or were microphonic. Many were both. Maybe two of them were useable. And even then they weren't as noise-free as the original one that came with the amp. :( <P>I recall doing a similar bunch of testing with Ei 12AX7s, but I ended up with many more of them being useable. :roll:
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Re: EF86

Postby greyhound on Tue Jun 19, 2001 6:40 am

can you hold it up to the light? :cool:
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