rharley5652
468 posts
Apr 21, 2011
12:47 PM
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Manufacturer's Description for Electro-Harmonix 6L6EH Power Amplifier Tube
Electro-Harmonix is rocking the vacuum tube community with the superior quality of the "EH" series tubes. Electro-Harmonix sound effects are world renown for the soulful warmth of their analog sound. The new line of "EH" premium tubes continues in this tradition of classic tone.
Modeled after the vintage RCA 6L6GC "blackplate," the 6L6EH features large plate dimensions and improved grid structure for increased power handling capabilities. Also features mica spacers with metal springs to eliminate tube rattle and microphonics. The 6L6EH offers tone and performance superior to any other 6L6 or KT66 type.
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Simply Unique Kustom Mic's By Rharley
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LIP RIPPER
426 posts
Apr 21, 2011
12:56 PM
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So, leave it in and forget about my Sylvania tube?
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JBharmonica
25 posts
Apr 21, 2011
1:38 PM
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Regarding transconductance and mu: These parameters are a bit more than
half for a 6V6 relative to a 6L6 i.e. the 'V' has half the gm of an 'L'.
This fact means that for identical plate voltage, screen voltage and bias
voltage, the 'V' will settle to an idle current of about half the value
of a 6L6. This is borne out in actual use and greatly simplifies the
"bias option" circuit requirements for amps that are to accomodate both
types of tube.
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JB
http://www.facebook.com/jbharmonica
jbustillos@gmail.com
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5F6H
642 posts
Apr 21, 2011
4:03 PM
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I don't know why 6L6 are getting a mention? The OP only appears to be asking about 6V6 type tubes.
Your EH6V6 is equivalent to the Sylvania 6V6GT ("G" means "glass" as opposed to metal case, "T" is an upgrade over a plain old "G" and may be followed by an "A" or a "B", or the "G" can be prefixed by a "W" to signify a military grade tube.
In the EH case it stands for "Electro Harmonix".
But all these designations are not really relevant to modern day tubes (all of which are "GT" equivalent at least, modern tubes will also take higher voltages than many NOS vintage tubes, but the NOS can usually take more current...apart from the JJ that takes voltage and current, but may sound stiff in comparison to some other 6V6), you only mention having one of each, so I'll assume that we are talking about a single-ended champ style amp with one power tube...in this case, use the tube that sounds best to you.
If the amp in question is fixed bias, like a tolex Princeton, or a tolex Deluxe/Deluxe Reverb, bias current should be checked on installation.
JBHarmonica, I'm not aware of any amps that run 6V6 & 6L6 at identical voltages, musical instrument amps typically have unregulated power supplies, so that when a low current draw 6V6 is placed in a 6L6 socket, plate & screen voltages rise. The reverse is true when subbing 6V6 for 6L6 & this should never be attempted unless the power transformer current capabilities will support the bigger tube.
Last Edited by on Apr 21, 2011 4:15 PM
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Jim Rumbaugh
487 posts
Apr 21, 2011
5:17 PM
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My instructor (in 1969) said GT = Glass Tube.
As far as 6L6 vs 6V6, I may be wrong, but I thought the 6V6 was rated at about 10 watts and the 6L6 at 20 watts.
I do remember the 6L6a and 6L6b were about the same, but the 6L6c took a little more bias to cut off, and it could handle a few more watts. (correction..., It could handle a little more power and volts but the bias is the same. I bet I remember the higher bias from reading schematics that had higher plate voltages. I just read that the "c" is an exact replacment for the "a" and "b")
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intermediate level (+) player per the Adam Gussow Scale, Started playing 2001
Last Edited by on Apr 21, 2011 6:40 PM
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rharley5652
469 posts
Apr 21, 2011
10:26 PM
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@ 5F6H,.
"I don't know why 6L6 are getting a mention?"
Because it tells of the "EH" series tubes = Electro-Harmonix
Th OP ask about "What does the suffix represent?"
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Simply Unique Kustom Mic's By Rharley
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5F6H
643 posts
Apr 22, 2011
3:00 AM
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"As far as 6L6 vs 6V6, I may be wrong, but I thought the 6V6 was rated at about 10 watts and the 6L6 at 20 watts."
Hi Jim, 6V6 current production/6V6GT NOS are nominally rated at 14W. 6L6GC/WGC/WGB are nominally rated at 30W, however not many current production tubes will take this kind of plate dissipation, the JJ will & the Sovtek 5881/6L6WXT is pretty bullet proof, but for safety's sake I'd treat the majority of modern 6L6GC as 25W tubes & bias accordingly.
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LIP RIPPER
427 posts
Apr 22, 2011
3:32 AM
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Yes it is in a Champ. I plugged the old Sylvania in and I liked the differnce for sure. But after a minute it quit. The tube was still lit so I let things cool off, put the new tube back in and the amp worked again. It's too bad because I really liked the tone of the Sylvania.
Thanks for the input guys, I appreciate it.
LR
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chromaticblues
786 posts
Apr 22, 2011
4:51 AM
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@ Lip Ripper I'll be honest the Sylvania is not the best choice for comparing to newer tubes the sylvania 6v6GT always sounded alittle bright/brittle. I have had many from the 50' and 60's and what you read about RCA 6v6's from that period is true. What has happened is enough time has passed where most of the good tubes are gone. If old RCA tubes are to rich for your blood try some old GE 6v6's from the 50's. I've had some very good sounding GE's. Its getting harder and harder to find good high output NOS tubes. About 15 years ago I bought enough RCA's to last the rest of my life. I new this would happen sooner then latter.
I have not tried the 6V6EH. So I can't help there.
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LIP RIPPER
428 posts
Apr 22, 2011
6:27 AM
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You're right, I have tried other Sylvania tubes, namely preamp and I didn't care for them. This 6V6 I have came in a box at auction and I just liked it in this hand wired Champ. I do like the RCA tubes and wondered about the GE so I'll keep that in mind.
LR
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