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15th December 2007, 12:20 AM
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#1 |
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diyAudio Member
Join Date: Oct 2007
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matched tubes?
I'm looking to pick up a pair of matched Mullard el34's for a marshal 18watt. What should I be looking for in the numbers people are posting about the matching?
are these matched well? mullard el34 |
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15th December 2007, 02:53 AM
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#2 |
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diyAudio Member
Join Date: Mar 2007
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Marshall 18W uses a pair of EL84
And matched pairs aren't so necessary for guitar amps. Just so long as you can bias them properly.
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Everything I need to know I learned from catching smart people and eating their braaaaains... |
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15th December 2007, 10:44 AM
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#3 | |
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diyAudio Moderator Emeritus
Join Date: Jan 2003
Location: Near London. UK
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Re: matched tubes?
Quote:
 More seriously: You probably don't need matched valves. A single point measurement is only useful if it's at your operating condition. The AVO CT160 gm measurement is based on a very dubious assumption.
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16th December 2007, 03:04 PM
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#4 | |
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diyAudio Member
Join Date: Oct 2006
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Re: matched tubes?
Quote:
Yikes ... NOS tubes are expensive!! Personally, I recommend getting tubes from a vintage tube amp tech. Fortunately, there's one in my town that's very helpful: Larry Rodgers at (239) 649-8799. Last time I was there he had a Ceriatone TMB in for repairs and new tubes. It's an 18-watt that sounded very cool! |
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16th December 2007, 03:05 PM
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#5 | |
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diyAudio Member
Join Date: Dec 2006
Location: Southwest Chicago Suburbs
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Re: Re: matched tubes?
Quote:
1. Current matching of the valves/tubes is a real necessity in a Marshall since there is no individual bias adjustment. Tubes matched for cathode current are a requirement. 2. In discussing single vs. multi-point measurements and the way a CT160 measures Gm - it's not really relevant here. The absolute value(s) of Gm is not really a concern, it's Gm relative to each other that may be important. So as long as the method of measurement is consistent it's fine. Besides, some players prefer mismatched Gm, they like the tone better. But current matching is a must. The tubes on the eBay listing would have likely been fine. |
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16th December 2007, 10:37 PM
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#6 |
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diyAudio Member
Join Date: Jan 2005
Location: The emerald city, Seattle, WA.
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Ive been ripped off a couple times on eBay. You're much better off buying NOS tubes from reputable websites like AES or TubeDepot.
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16th December 2007, 10:57 PM
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#7 | |
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diyAudio Member
Join Date: Dec 2006
Location: Southwest Chicago Suburbs
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Quote:
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