5751 Preamp Tubes...
- Thread starter Nostalgic Distortion
- Start date
hamerfan
Well-known member
Re: 5751 Preamp Tubes...
I tried a lot of tubes in the v2 slot like 5751 from RCA, JAN Phillips and GE, same as 12at7 of different brands like telefunken, RCA, Mullard and Sylvania. My point is that amplication factor in these tubes is too low compared with a 12ax7, because both sections of the tubes are lower. Did anyone tried a 12dw7 in the V2 slot?
I tried a lot of tubes in the v2 slot like 5751 from RCA, JAN Phillips and GE, same as 12at7 of different brands like telefunken, RCA, Mullard and Sylvania. My point is that amplication factor in these tubes is too low compared with a 12ax7, because both sections of the tubes are lower. Did anyone tried a 12dw7 in the V2 slot?
misterwhizzy
Well-known member
Re: 5751 Preamp Tubes...
I ordered a JJ 5751 just to try to tame the gain on my JCA50H overdrive channel after reading this thread, and it really didn't sound good at all. It was way too fizzy and hairy. In V2 in that amp, a 12AU7 is much more effective. Now I can run my gain at 3 or 4 instead of 1 and have it sound good.
I ordered a JJ 5751 just to try to tame the gain on my JCA50H overdrive channel after reading this thread, and it really didn't sound good at all. It was way too fizzy and hairy. In V2 in that amp, a 12AU7 is much more effective. Now I can run my gain at 3 or 4 instead of 1 and have it sound good.
IM4Tone
New member
Re: 5751 Preamp Tubes...
'Recently I acquired a new Deluxe Reverb Reissue! While I'm quite happy with the amplifier overall I'd like to try and tame it's inherent upper mid spike...' That's because Deluxe Reverbs are the only BF amp that Fender wired with a permanent bright cap. 47 pF right at the volume control. Clip it out and lose the excessive treble. You can change tubes all you want, but that really won't cure it.
'Recently I acquired a new Deluxe Reverb Reissue! While I'm quite happy with the amplifier overall I'd like to try and tame it's inherent upper mid spike...' That's because Deluxe Reverbs are the only BF amp that Fender wired with a permanent bright cap. 47 pF right at the volume control. Clip it out and lose the excessive treble. You can change tubes all you want, but that really won't cure it.
NegativeEase
New member
Re: 5751 Preamp Tubes...
Good to hear you had a good experience. I'm not sure they are sourcing from 1 manufacturer or just China only -they may be a little more opportunistic (like Groove tubes and Ruby etc) and purchasing from wherever the price and quality is meets there supply needs. The reason I say this is -the EL34 shown on on their website is almost DEFINITELY a Russia made Tung Sol brand EHX tube.
I guess I could be wrong if the Chinese are using the identical socket color and look -but I doubt it.
Good to hear you had a good experience. I'm not sure they are sourcing from 1 manufacturer or just China only -they may be a little more opportunistic (like Groove tubes and Ruby etc) and purchasing from wherever the price and quality is meets there supply needs. The reason I say this is -the EL34 shown on on their website is almost DEFINITELY a Russia made Tung Sol brand EHX tube.
I guess I could be wrong if the Chinese are using the identical socket color and look -but I doubt it.
guitfiddle
firstlessonologist
Re: 5751 Preamp Tubes...
I have an old RCA 5751 in V1 of my OR15. It still has way more gain than I'll ever use, it just comes in at a different setting on the gain knob. It did reduce some of the fizz on the top end.
I have an old RCA 5751 in V1 of my OR15. It still has way more gain than I'll ever use, it just comes in at a different setting on the gain knob. It did reduce some of the fizz on the top end.
PFDarkside
of the Forum
Re: 5751 Preamp Tubes...
I like how Wampler has a 6 position rotary control with different bright caps. Seems like a good idea. Or at least like Friedman with 2 values and a bypass.
I like how Wampler has a 6 position rotary control with different bright caps. Seems like a good idea. Or at least like Friedman with 2 values and a bypass.
Gtrjunior
Well-known member
Re: 5751 Preamp Tubes...
I’m pretty sure you’re right. They are basically a re-brander as you said, like GT etc.
I’m pretty sure you’re right. They are basically a re-brander as you said, like GT etc.
