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Old 14th March 2006, 06:51 AM   #1
sardonx is offline sardonx  Canada
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Default Any EL84 alternatives?

I'm looking to experiment with my antique sound labs OTL32 head/preamp and swap the EL84's with somethign that gives a different sound if possible. I've already chagned the 12au7's with 12BH7's. Does an EL84 alternative exist?
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Old 14th March 2006, 07:27 AM   #2
SY is offline SY  United States
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With some rebiasing and a bit of socket rewiring, 6973 and 6CZ5 are very interesting alternatives.
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Old 14th March 2006, 03:49 PM   #3
Ansius is offline Ansius  Latvia
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it doses, indeed - russian 6p14p it is reorted that it is not as bright, but works. it is also good if you get 6p14p-EV - military grade.
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Old 14th March 2006, 03:49 PM   #4
Ansius is offline Ansius  Latvia
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also 6BQ5 will work
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Old 14th March 2006, 04:36 PM   #5
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EL82 looks the same and will drop in the same socket wiring but has lower dissipation ratings. If your amp wasn't asking the most from a EL84 as set up, this could be a possible alternate. 6DY5 and 6CW5 is similar to EL82, also drop-in pin compatible to EL84/6BQ5.

Should try to find 6DIY5's. (FYI that's an attempt at a joke)
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Old 14th March 2006, 05:09 PM   #6
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Nobody mentioned the SV83 yet? Decware-haters?
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Old 14th March 2006, 09:00 PM   #7
sardonx is offline sardonx  Canada
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thanks for the responses.. I'll see if i can find some of those!
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Old 14th March 2006, 09:02 PM   #8
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find an extra 2 Volts for a 8BQ5

Andrew
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Old 14th March 2006, 09:05 PM   #9
rdf is offline rdf  Canada
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At the risk of sounding dense, have you tried different makes of EL84? In my experience there's a wide variance in measured and audible performance, depending on circuit. A JJ doesn't behave like an EH for example. I have to think an OTL headphone amp would make those differences obvious.
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Old 14th March 2006, 11:17 PM   #10
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EL84s sound very different from each other in my EICO HF81 and HF12
B+ is 330, cathode bias.
My experience with tube rolling---

New JJs: Very fat and great lower end, a bit light on the upper end.

New EHs: great sounding all around tube, plenty of bass and good high end.

New Sovtek: These were labled PRO COM and I was told they were the inexpensive Sovtek: Nothing noteable.

NOS Mullards (the real British ones): Exceptional high end and fantastic sound stage, Perfect for acoustic guitar, vocals, woodwinds, strings etc. Much less thump on the bottom end.

NOS RCA: Nice sounding all around tube. Not much kick.

I'm using the EHs all the time but I like many different types of music so they work best for me.

The line stage tubes make a big diffenence in my amp (12au7)
You might experiment there also since they're pretty cheap and you can always use them somewhere.
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