advice: 6L6 hextet for SUper Twin head for bass guitar - diyAudio
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Old 16th December 2012, 12:47 AM   #1
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Default advice: 6L6 hextet for SUper Twin head for bass guitar

This Super Twin I converted into a head cabinet for bass guitar came with 4 Ruby 6L6GCMSTR which I think are relabelled russian tubes of some kind, and 2 Groove Tubes GT6L6S with power-match code "7" which I think are relabelled JJ tubes.

They were in the wrong sockets, so push was 3 Ruby and pull was 2 Ruby and 2 Groove Tubes.

I want to use this for bass, so power matters much more than breakup mode.

What's my best course of action? Stick with what I have and stick them in the correct sockets so push & pull at least have the same complement? Trade someone the GTs for a pair of Ruby? Look for 4 GTs w/ code "7" and sell the Rubys? Look for old made in the USA tubes?

Last edited by cyclecamper; 16th December 2012 at 12:59 AM.
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Old 16th December 2012, 04:59 AM   #2
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I'd buy 6 new ones from here
6L6GC, JJ | Antique Electronic Supply LLC
they will match 6 up for you then you no what you've got, unless you hav access to a tube testor and trying to find 6 second hand that match close could be a big ask.
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Old 16th December 2012, 08:40 AM   #3
GeorgK is offline GeorgK  Austria
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If vou do not have a chance to test the tubes for wear and matching this is difficult to answer. If they do not *look* too used I personally would give it a try and put equal combinations into each half of the power stage as you suggested, turn the "matching" pot to mid position and go.
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Old 16th December 2012, 08:57 AM   #4
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I don't know man I heard bad things about the JJ 6l6gc's, What you have could be Chinese or the JJs or some other Russian Variant. You could look into the new Tung-sols I thought those sounded good as well as the SED/Svetlana
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Old 16th December 2012, 08:59 AM   #5
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Those old RCA black-plate 6L6's have some real Magic going on inside them but you are gonna pay for it
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Old 16th December 2012, 09:05 AM   #6
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Its up to you I would just experiment with different ones then you could find what suites you're tastes, I'm just scared of current production tubes, I have had some nightmares or it was just really bad luck lol
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Old 16th December 2012, 09:14 AM   #7
GeorgK is offline GeorgK  Austria
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Had not too good experience with JJ either. If they withstand the first three months or so they may be as durable as any other brand tube, but I had too many failing within a few days and therefore stopped using them. The ones in the the super twin are not really new as I understand, so why not in this case. Anyway, it depends on how much you are willing to spend.
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Old 16th December 2012, 09:43 AM   #8
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Yeah lots of the JJs dead out of the brand new boxes etc lol but usually if they make it past that 3 month point they are some keepers lol I have 1 JJ ecc83s that sucker is still going its like 3 or 4 years old I went through like 10 of them over the years some dead right out of the box others would last a few days or a month etc lol. Their 6v6s is kinda a hit and miss though they sound pretty good but they will rattle themselves apart lol
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Old 16th December 2012, 09:51 AM   #9
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I'm interested in trying something different myself though the JJ eec83s had good gain but I found its kind of hollow/narrow on the low end and harmonics are nothing special, they seem to have less Edge too. I miss some of those old Chinese 12AX7s I had, those were some edgy bastards lol bright but man they could cut buddy lol, just more of a pissed off sound lol
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Old 16th December 2012, 11:29 AM   #10
JMFahey is offline JMFahey  Argentina
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What's wrong with actual measuring vs. guessing?
Scope the amp driven to *just* clipping and check:
1) how much it's actually putting out. Anything above 120W RMS is excellent.
2) symmetry.
If symmetrical clipping within 5% or 10% (which I doubt is happening now , except by sheer chance), fine.
If not, do the musical chairs game:switch right/left a couple until you get a match.
Wit the bias balancing pot set to middle, of course, so you are actually matching thge tubes themselves.
When real close, only then use the pot for final tweaking.
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