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FDP Forum / Fender Amps: 1985 - Current / Mismatched 6V6 power tubes DRRI

Humphreyplugg

Uk

May 23rd, 2019 02:47 PM   Edit   Profile  

Hi

I've just bought 2 new Electro Harmonix 6V6 power tubes. I installed them in my DRRI and set about adjusting the bias. I notice the tubes aren't matched. One is about 4ma different to the other.

Is this a problem? I've only had matched tubes before.
I bought these from Thomann of Germany, and they didn't offer a matched set option.

thanks for any advice
Humphrey


willie

Too Near Atlanta GA

Amp Tech Emeritus
May 23rd, 2019 03:36 PM   Edit   Profile  

I wouldn't call that a close match, but I also wouldn't say they were unmatched...the amp won't know the difference and you certainly will not hear any difference if they were exact matches. Tube matching is really a bit controversial anyway. Plug em in and enjoy them...not to worry.

w

Leftee
Contributing Member
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VA

May 23rd, 2019 04:00 PM   Edit   Profile  

If they sound good they are good.

Some of the greatest recordings we enjoy were made through amps with who-knows-what for tubes.

Humphreyplugg

Uk

May 23rd, 2019 04:19 PM   Edit   Profile  

Cheers guys. They do sound good actually. I've probably been sold bit of a fallacy, as I usually buy matched pairs for a extra money.

I'm going to stop being OCD and enjoy them!

H



willie

Too Near Atlanta GA

Amp Tech Emeritus
May 23rd, 2019 06:35 PM   Edit   Profile  

Good O....just do it. :)

w

BbendFender
Contributing Member
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American Patriot

About as ordinary as you can get.
Jun 10th, 2019 09:55 AM   Edit   Profile  

Uncle Doug found the tubes in my Princeton Reverb to not be matched but he also said the amp sounded very good. He left in the unmatched tubes.

Twangmeister

Philly/NL, CT

Retired
Jun 11th, 2019 07:11 PM   Edit   Profile  

Matched tubes were unusual 40-50 years ago but our amps sounded pretty good. "Matched" to us that cared meant a set of Sylvanias, GEs in the power section rather than mix 'n matched power tubes. True matched power tubes were for WiFi aficionados. Amp tone going south with functional power tubes must have been from worsening bias mismatch.

I bought my first amp with matched power tubes in 2004. New to me was that tone was maintained until one failed--not uncommon with today's tubes. So now I buy tubes in matched sets.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jun 11th, 2019 08:14 PM   Edit   Profile  

WiFi..HiFi....whatever :)

w

BrentD
Contributing Member
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Michigan

Jun 13th, 2019 08:54 AM   Edit   Profile  

In the "old days," did you guys rebias at every tube change like we do now?

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jun 13th, 2019 09:39 AM   Edit   Profile  

No...only set the bias voltage per what was spec on the schematic. Never set cathode current or considered tube max plate dissipation. This goes back to when I had my first jobs doing amp work in the early 1960's.

w

BrentD
Contributing Member
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Michigan

Jun 13th, 2019 01:25 PM   Edit   Profile  

I figured it was a lot rarer! Did you notice any ill effects? Do you think we overdo it now?

Leftee
Contributing Member
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VA

The Escalator
Jun 13th, 2019 02:22 PM   Edit   Profile  

The Internet makes obsessing over things super-convenient.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Jun 13th, 2019 02:26 PM   Edit   Profile  

No, not that I recall. Of course, we were routinely installing RCA, Sylvania, GE and the like, made in USA, tubes back then...not that such was a major issue, but they were rugged tubes. I first learned to be aware of total tube cathode current draw when I began working on high fidelity sound gear...audiophile type gear. Seemed like a bit of overkill at the time. :)

w

FDP Forum / Fender Amps: 1985 - Current / Mismatched 6V6 power tubes DRRI




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