Joeytpg
Active member
I've heard great things about these tubes, specially for cleans......
anyone?
anyone?
duesentrieb
Well-known member
Ailean
New member
I used 5751's in an amp that I only used for the clean channel. They did a great job for the cleans, but the lead channel was horrible (not entirely the tubes fault, the lead was pretty bad before). However, used on the clean channel with a dist pedal infront it worked just fine.
I wasn't using Phillips so I can't comment on the specifics of their tone. I think you'll lose more in your lead channel than you gain in your cleans, but you should be able to compensate with a pedal.
I wasn't using Phillips so I can't comment on the specifics of their tone. I think you'll lose more in your lead channel than you gain in your cleans, but you should be able to compensate with a pedal.
A
Anonymous
Guest
Joey,
I just re-tubed my Einstein combo with KT77's after owning it for 3+ years. Olaf told me that my original EL-34's are still good and may be used as spares. I got the bias on the KT77's to read 34.1 on tube A and 34.2 on tube B.
Awhile ago, Olaf mentioned to me about the 5751's, so I got one and when I replaced my power tubes, I did the following. Replaced V-1 NOS Mullard 12AX7 with another NOS MUllard 12AX7 with a different build configuration. Replaced V-2 NOS Mullard 12AT7 with a NOS 5751, replaced V-3 with a different NOS Mullard 12AT7, replaced phase inverter NOS Muallard 12AT7 with a balanced NOS 12AT7. The tubes I replaced in the pre amp section were all perfectly fine tubes, but I tried out different build types. They were all NOS old tubes that I replaced.
I did this all at the same time. The amp has a totally different voice now and has properties of a great EL-34 and a 6L6. The V-2 tube swap to a NOS 5751 gave me more chance to open up the gain on that channel and still have a clear, transparent voice with more singing violin-esque sustain.
I never turn up gain on channel two past 9 o'clock as it just clutters up the clarity of that tone, but with the 5751, the gain may now be turned up to about 9:30-10:00 o'clock.
While this doesn't seem like a big deal, the clarity of the tone is way better, and the sustain is there in a larger amount. I'm sure changing out the other tubes had something to do with it, as well. I know that the basic voice of the power tubes is very EL-34-like but with a more defined glassy top end and a sweeter tone all around due to the JJ KT77's.
The Mullards have always added a sweeter basic tone to the amp to my deaf ears, but because of the 5751, it seems to have affected the amp in the same way on channel two's distortion, that changing from EL-34's to KT77's have affected it. The tone on channel two seems to have a wider, more open tone, but sweet and with more then enough sustain to play many styles of music by just adjusting the volume controls on the guitar now, yet still allowing sustain to go into controlled feedback when my master volumes are up at about 11 o'clock or higher.
While the amp's tone is the sum of it's tube types, I hear a difference that is very pleasing, and not the least bit offensive when the treble on channel two is advanced at lower playing volumes to about 2 o'clock . At higher playing volumes, I leave the treble on channel two at no higher then 12 o'clock, with the bass at 10:30, mids at 11, presence at 2, channel volume at 4 and deep bass at 11-12 o'clock, gain at 9-10 o'clock.
I just re-tubed my Einstein combo with KT77's after owning it for 3+ years. Olaf told me that my original EL-34's are still good and may be used as spares. I got the bias on the KT77's to read 34.1 on tube A and 34.2 on tube B.
Awhile ago, Olaf mentioned to me about the 5751's, so I got one and when I replaced my power tubes, I did the following. Replaced V-1 NOS Mullard 12AX7 with another NOS MUllard 12AX7 with a different build configuration. Replaced V-2 NOS Mullard 12AT7 with a NOS 5751, replaced V-3 with a different NOS Mullard 12AT7, replaced phase inverter NOS Muallard 12AT7 with a balanced NOS 12AT7. The tubes I replaced in the pre amp section were all perfectly fine tubes, but I tried out different build types. They were all NOS old tubes that I replaced.
I did this all at the same time. The amp has a totally different voice now and has properties of a great EL-34 and a 6L6. The V-2 tube swap to a NOS 5751 gave me more chance to open up the gain on that channel and still have a clear, transparent voice with more singing violin-esque sustain.
I never turn up gain on channel two past 9 o'clock as it just clutters up the clarity of that tone, but with the 5751, the gain may now be turned up to about 9:30-10:00 o'clock.
While this doesn't seem like a big deal, the clarity of the tone is way better, and the sustain is there in a larger amount. I'm sure changing out the other tubes had something to do with it, as well. I know that the basic voice of the power tubes is very EL-34-like but with a more defined glassy top end and a sweeter tone all around due to the JJ KT77's.
The Mullards have always added a sweeter basic tone to the amp to my deaf ears, but because of the 5751, it seems to have affected the amp in the same way on channel two's distortion, that changing from EL-34's to KT77's have affected it. The tone on channel two seems to have a wider, more open tone, but sweet and with more then enough sustain to play many styles of music by just adjusting the volume controls on the guitar now, yet still allowing sustain to go into controlled feedback when my master volumes are up at about 11 o'clock or higher.
While the amp's tone is the sum of it's tube types, I hear a difference that is very pleasing, and not the least bit offensive when the treble on channel two is advanced at lower playing volumes to about 2 o'clock . At higher playing volumes, I leave the treble on channel two at no higher then 12 o'clock, with the bass at 10:30, mids at 11, presence at 2, channel volume at 4 and deep bass at 11-12 o'clock, gain at 9-10 o'clock.
Joeytpg
Active member
Thanks for that great detailed response Stephen 
Next time I order tubes I'll order one of those and try it out
Next time I order tubes I'll order one of those and try it out
Me
Member
I've just ordered some of these for my Herbie. I'll let you know. Sounds like I have a preamp tube gone bad so I bit the bullet and have gone for a full preamp retube so I don't have any cheap chinese saboteurs hiding and waiting in my diezel anymore!
I ordered (from Watford Valves
1 cryogenically treated Philips 5751 for my VHT valvulator (to reduce the gain into my Herbie front end slightly and for clean clarity).
Another cryogenically treated Philips 5751 for my V1 (to reduce the gain of my Herbie front end slightly for clean clarity).
A Harma Retro ECC83 for the V2 (for crunching early distortion).
3 Harma STR ECC83 for V3-5
1 Harma STR Balanced ECC81 for the phase inverter (V6)
I'll let you know how they go. I may end up switching them all about to different positions anyway to see the difference! I've already been told I have the clearest sounding amp out they've heard by a few people, so this should make it even clearer!
I ordered (from Watford Valves
1 cryogenically treated Philips 5751 for my VHT valvulator (to reduce the gain into my Herbie front end slightly and for clean clarity).
Another cryogenically treated Philips 5751 for my V1 (to reduce the gain of my Herbie front end slightly for clean clarity).
A Harma Retro ECC83 for the V2 (for crunching early distortion).
3 Harma STR ECC83 for V3-5
1 Harma STR Balanced ECC81 for the phase inverter (V6)
I'll let you know how they go. I may end up switching them all about to different positions anyway to see the difference! I've already been told I have the clearest sounding amp out they've heard by a few people, so this should make it even clearer!