It is a lower plate resistance than a 12AT7, but much better bandwidth, and passes high tube current like a 12AT7 , and with the right amount of bias, can comfortably run into the same sort of transformer reflected load as a 12AT7 and it has lower gain than a 12AT7. KyAnneFeb 9, You must log in or sign up to reply here. Darker reverb and less of it. Do you already have an account? Wally , Feb 9, This dual triode tube is one half 12au7, one half 12ax7. Also how are Sylvania rated in the US – do you like em?
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Darker reverb and less of it. All the 12ax7, 12at7, 12ay7 and so forth are.
I used a 12AX7 again but this time I am shooting for more gain by increasing Ra. And yes, getting all the GT preamp tubes out and old but ‘reliable’ tubes in should help these amps.
Tried a 12AU7 in DRRI reverb send…
Yes, the amp came loaded with GT preamps and one by one been replaced to better effect. It would not damage it but rwverb might not sound great.
It 12au a lower plate resistance than a 12AT7, but much better bandwidth, and passes high tube current like a 12AT7and with the right amount revetb bias, can comfortably run into the same sort of transformer reflected load as a 12AT7 and it has lower gain than a 12AT7.
So, by that data, Section A 12Au7 in that V3 does yield a quite different result, ime. Changing the reverb tank to a shorter delay can also help. Feb 10, 8. Share This Page Tweet. Feb 9, 2. Could be you like it who knows?
12AU7 in the phase inverter for Fender amps – comments please
Or for BFs, another option is to remove the driver cathode bypass cap. Feb 11, Yes, my password is: But it’s not a great tube for tube amps, except as reverb driver or such. I’m thinking a 12AU7 would help the sweet spot be larger.
Anyway you can try a 12au7 there but you’ll be dropping gain at the same time. EddieLocrianFeb 9, The usual don’t kill yourself by being shocked statement applies.
Maybe the 12AT7 in that position is a very weak 12AT7???? So there was a silver lining and everything was ok again Unless I am mistaken, if one simply inserted a 12DW7 into the stock circuit, the reverb woudl remain the same while the gain of the Vib ch would be decreased. Well, if that data is correct; then the socket has to be rewired in order to eeverb the reverb gain rather than the preamp gain with that 12DW7.
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For SFs, fit an unbypassed 2k2 cathode resistor additional benefit of the tube running much cooler than with a 1k or ohm resistor. With reerb 12AX7 where both tridoes are identical, the sections are not named in the data sheets They are small 25volt 25uf electrolytics soldered in parallel with the cathode resistors.
This is both being operated at VDC plate potential. Perhaps not as unfocussed sounding.
That will give you more range on the control. The lower gain 12AU7 triode, Section pins 6,7 and would be wired to the preamp gain circuit. Feb 10, 9. Rreverb theory that my original 12AT7 was poor seems to hold water so I will run with that. If you insert a K-toK rheostat-wired pot in place of the K, you have a master volume of sorts that lets you attenuate signal to taste.