1962 fender pro amp

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Re: 1962 fender pro amp

Postby slider313 on Wed Sep 07, 2016 8:40 pm

Dean Jr. wrote:
slider313 wrote:5881's or 6L6WGB's will work fine. Just be sure not to exceed the maximum plate dissipation of 23 watts.


Well, being that the amp is fixed biased one might not want to push them that hard. 23 x .70 = 16.1 watts if my head is working, right? IME, anything from 50%...11.5 watts... to about 16 watts would be good to go. I tend to end up in the 60-70% range. YMMV....


I usually bias in the 55%-65% range with 6L6 types. I had a '61 Concert running a pair of original Tung Sol 5881's at 63% mpd: 30ma@480v for a long, long time.
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Re: 1962 fender pro amp

Postby Dean Jr. on Wed Sep 07, 2016 10:34 pm

The spec sheets for the 5881's rate the max plate voltage at 400VDC. The 6L6GC is rated for 500VDc. Those ratings might be conservative, but there is what the information states.
6L6gc
Vh Ih VaMax Vg2Max VhkMax PaMax Pg2Max
6.3 0.9 500 500 +/-200 30 5

5881
6.3 0.9 360 270 23.0 3.0

or.....http://www.mif.pg.gda.pl/homepages/fran ... 5/5881.pdf this shows 400VDC.

slider's testimony has to stand witness, eh?
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Re: 1962 fender pro amp

Postby slider313 on Thu Sep 08, 2016 4:31 am

Well the spec sheet for the RCA 6V6GTA states 350v max and we all know they do just fine in blackface Deluxe Reverbs running upwards of 425v +.
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Re: 1962 fender pro amp

Postby Dean Jr. on Thu Sep 08, 2016 3:32 pm

Slider, the Jim Kelley FACS amp ran the 6V6GTV's at very close to 500Pv...475VDC, iirc. AS I noted, perhaps the specs were conservative. He specified GE's.
IF you want to look at an amp that pushed things way beyond the specs, take a look at what MusicMan ran at the 6L6's in their '150' series of amps....700+ Pv!!! They ran only 350volts to the screens, though.

http://schematicheaven.net/newamps/musi ... 75-150.pdf
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