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FDP Forum / Amp Mods, Repairs, and Projects / The end is near....or not

Georgos

Humboldt County, CA

Aspiring to play fewer, better notes
Mar 18th, 2012 07:23 PM   Edit   Profile   Print Topic   Search Topic

The output tubes in my '63 Vibroverb reissue are glowing, each in a very different way; One is glowing with blue and orange only in a small region near the top of the tube, while the other is lighting up well down its length. The amp sounds good to me, but it's new to me too. Volume wise it is not really much louder than my 6G2 Princeton, that is its headroom for clean is not much above the 12-watter. With two 6L6 output tubes, I'm expecting more horsepower. Is it time to retube?

JBLTWIN1

usa

you want me to play where?
Mar 19th, 2012 06:40 AM   Edit   Profile   Print Topic   Search Topic

It's time to have the bias checked. At least one tube is running at critical mass!

anteriorl5

USA

Mar 19th, 2012 01:59 PM   Edit   Profile   Print Topic   Search Topic

do you have hum?

pdf64

UK

Mar 19th, 2012 03:50 PM   Edit   Profile   Print Topic   Search Topic

Blue glow doesn't indicate a problem, see link.
Spare, 'known good' tubes are a great idea.
Buy a set of 4 matched power tubes then you can swap between them without having to worry about bias adjustment (once the amp has been set up to them).

blue glow

Fritz_D_Cat
Contributing Member
**********
*

better living

through chemistry!
Mar 19th, 2012 07:00 PM   Edit   Profile   Print Topic   Search Topic

Agree with pdf64. You can rarely get a good visual on output tubes unless you have redplating going on.

telerocker2002

usa

Apr 1st, 2012 11:43 PM   Edit   Profile   Print Topic   Search Topic

I have Bendix 5992 power tubes in my 1953 Deluxe and they have an awesome blue/violet glow when powered up. Normal for that tube.

rfrakes331K
Contributing Member

USA

RonHalen Jokingly He Says
Apr 2nd, 2012 06:18 PM   Edit   Profile   Print Topic   Search Topic

I am thinking of going out and buying a Dumble before Oct and a Rory Gallagher Strat. If the end of the world is coming. It won't matter.

GoranS
Contributing Member
**********
***

Southern Sweden

What? Me worry?
Apr 4th, 2012 08:13 AM   Edit   Profile   Print Topic   Search Topic

Blue glow

Just saying

rfrakes331K
Contributing Member

USA

RonHalen Jokingly He Says
Apr 20th, 2012 03:06 PM   Edit   Profile   Print Topic   Search Topic

Is there any nicer a color than that? Thanks Goran!

FDP Forum / Amp Mods, Repairs, and Projects / The end is near....or not




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