Wow! Thats not even close to my 12AU7 rolling experiences. I've got at least 8 sets of differing makes, a mixture of Military and standard type, the differences are sometimes huge to say the least!! The interesting thing to try is a mixture of different tubes..... what output coupling caps do you have in your GG?
I agree that the 6SN7 may run fine at lower voltage just by adjusting its operating parameters a bit for good linearity, but only experimentation will tell.
Mark
I can't open the file containing the zip file (with the text and schematics of the 6SN7 version of the GG) posted through Sklimek. Can someone send this file to my e-mail? My e-mail is my username followed by @gmail.com
Thank you very much
Erik
Thank you very much
Erik
Reply to Mark A
I have not completed the GG yet. That statement of 12AU7s sound the same are replies on the Transcendent site forum from other GG owners.
Something I think about is many may own less than acurate & detailed power amps plus speakers. If one does not have real high quality electronics & speakers downstream, they can not hear small, but important differences in sonics.
I have not completed the GG yet. That statement of 12AU7s sound the same are replies on the Transcendent site forum from other GG owners.
Something I think about is many may own less than acurate & detailed power amps plus speakers. If one does not have real high quality electronics & speakers downstream, they can not hear small, but important differences in sonics.
Rick,
I have Dynaudio Audience 9's, a pair of DIY Aleph 2's and a KSA-50 MK-2 clone... fed from a DIY 12AU7 GG of course. The difference in 12AU7's is quite easily heard on my system. So far NOS Tung-Sols are the best sounfing of what I've bought. I have an assortment of military tubes and some Telefunkens, GE's, and RCA's. Yes, the Tung- Sols even sound better than the Telefunkens!! A friend has an identically built GG running a pair of DIY Pro-Ac 2.5's powered by a very overbuilt DIY Aleph 3 and he reports similar things as I.
Mark
I have Dynaudio Audience 9's, a pair of DIY Aleph 2's and a KSA-50 MK-2 clone... fed from a DIY 12AU7 GG of course. The difference in 12AU7's is quite easily heard on my system. So far NOS Tung-Sols are the best sounfing of what I've bought. I have an assortment of military tubes and some Telefunkens, GE's, and RCA's. Yes, the Tung- Sols even sound better than the Telefunkens!! A friend has an identically built GG running a pair of DIY Pro-Ac 2.5's powered by a very overbuilt DIY Aleph 3 and he reports similar things as I.
Mark
Mark,
> Dynaudio Audience 9s, diy Aleph 2s and a KSA-50 MK-2 clone
You and your friend have classy gear . . which the more determined of us will move towards . . all the better to make informed judgements
Rick
> Dynaudio Audience 9s, diy Aleph 2s and a KSA-50 MK-2 clone
You and your friend have classy gear . . which the more determined of us will move towards . . all the better to make informed judgements
Rick
Mark A
Your friends system- Pro Ac 2.5 Response. I use modified Pro Ac 2.5s. The tweeter was changed to a Seas T25 Excel with new crossovers. Crossovers are detailed off of the model 'Ella 1'.
The difference is substantial in the mids & highs. The tweeters cross at 2kHz. I do not recommend more that 40-watts at 2K.
My power amps are DIY PPP triode 6V6GT monoblocks with MQ iron. They play as well as an almost identical PP 45 tube monoblocks I built for another audiophile. Quite surprising, indeed.
Your friends system- Pro Ac 2.5 Response. I use modified Pro Ac 2.5s. The tweeter was changed to a Seas T25 Excel with new crossovers. Crossovers are detailed off of the model 'Ella 1'.
The difference is substantial in the mids & highs. The tweeters cross at 2kHz. I do not recommend more that 40-watts at 2K.
My power amps are DIY PPP triode 6V6GT monoblocks with MQ iron. They play as well as an almost identical PP 45 tube monoblocks I built for another audiophile. Quite surprising, indeed.
Weakest Link
Mark said:
And Ed (Mongo) said:
Ed, you should check the weight of my 'overbuilt Aleph 3'. As that old game show goes: I AM the weakest link!
Amperex: I used the ScanSpeak drivers as spec'd in the clone model, but have a heavily modified X-over. They are sounding fantastic, and I am interested in how they sound with the new Krell Klone when it is finished.
Should I add that the ProAc clones are 'overbuilt'? I got to stop doing this!
My bedroom system uses an Eico ST-40 with NOS tubes, and my greatest thrift store find, a pair of Coral speakers. Sweet!
Lyndon
Mark said:
And Ed (Mongo) said:
Ed, you should check the weight of my 'overbuilt Aleph 3'. As that old game show goes: I AM the weakest link!
Amperex: I used the ScanSpeak drivers as spec'd in the clone model, but have a heavily modified X-over. They are sounding fantastic, and I am interested in how they sound with the new Krell Klone when it is finished.
Should I add that the ProAc clones are 'overbuilt'? I got to stop doing this!
My bedroom system uses an Eico ST-40 with NOS tubes, and my greatest thrift store find, a pair of Coral speakers. Sweet!
Lyndon
Lmao
Thanks guys, all of you.
The only strong links in my system are my speakers:
Lynn Olson's ME2's (abreviated Ariels) with a Marchand XM-9 x-over at 94 Hz. The bottom end is handled by stereo sub's: 2-SS 25W/8565 on each side in 3 cf sealed enclosures.
I Love You All, but remember, Mongo straight
Thanks guys, all of you.
The only strong links in my system are my speakers:
Lynn Olson's ME2's (abreviated Ariels) with a Marchand XM-9 x-over at 94 Hz. The bottom end is handled by stereo sub's: 2-SS 25W/8565 on each side in 3 cf sealed enclosures.
I Love You All, but remember, Mongo straight
Re: Lmao
At one point in my sojourn, i found my XM-9 to be the weak link & sold it....
dave
bg40403 said:
At one point in my sojourn, i found my XM-9 to be the weak link & sold it....
dave
PPP 6V6GT monoblocks
These are fashoned off of the 'poinz' design. I needed more power thus used parallel push-pull 6V6 (actually a 7C5). A 7C5 is a loctal based 6V6 & usually available in match sets of 8 due to low demand. Also, NOS is only $5 each. I replaced the 'poinz' design 5965 phase splitter with a Raytheon 6CG7. Being lower gain, the redesign needs a preamp with the 6CG7.
For some reason, the Raytheon (real Ray with black plates, not Japan manu) is the only 6CG7 that performs excellent sonically. If Raytheon were not available, I would use a Sylvania 6SN7GT or VT-231 with T type plates. The PS is an LCLC to the 6V6 & another LC for the 6CG7 B+. The 6CG7 is 'floated' up with a -140 supply at the cathode. The PS uses an oil cap at the last position in the LCLC & a Solen poly cap at the last position of the additional LC.
The audio trannys are MQ ST70 replacements but using the 4 ohm tap on 6 ohm speakers. My speakers measure closer to six ohms vs 8 ohms. The reflected impedance to the 6V6s are about 6K. If one builds this amp, use nothing less than 6K PP primary. This higher plate impedance just opens up the triode connected 6V6s to another world sonically. I also use 330 volts B+ on the 6V6 plates or 30 volts over spec. No issues to date. The 6V6s are hard bias with -25 volts.
The amp is a great performer & as good as a pair of PP 45s I built on the same chassis with top of line MQ pinstripe audio iron. That 'as good as PP 45s' should not be, but the 6V6 triode amp is just a freak performer. NOS 45s cost $100 each & NOS 7C5s cost $5 each.
These are fashoned off of the 'poinz' design. I needed more power thus used parallel push-pull 6V6 (actually a 7C5). A 7C5 is a loctal based 6V6 & usually available in match sets of 8 due to low demand. Also, NOS is only $5 each. I replaced the 'poinz' design 5965 phase splitter with a Raytheon 6CG7. Being lower gain, the redesign needs a preamp with the 6CG7.
For some reason, the Raytheon (real Ray with black plates, not Japan manu) is the only 6CG7 that performs excellent sonically. If Raytheon were not available, I would use a Sylvania 6SN7GT or VT-231 with T type plates. The PS is an LCLC to the 6V6 & another LC for the 6CG7 B+. The 6CG7 is 'floated' up with a -140 supply at the cathode. The PS uses an oil cap at the last position in the LCLC & a Solen poly cap at the last position of the additional LC.
The audio trannys are MQ ST70 replacements but using the 4 ohm tap on 6 ohm speakers. My speakers measure closer to six ohms vs 8 ohms. The reflected impedance to the 6V6s are about 6K. If one builds this amp, use nothing less than 6K PP primary. This higher plate impedance just opens up the triode connected 6V6s to another world sonically. I also use 330 volts B+ on the 6V6 plates or 30 volts over spec. No issues to date. The 6V6s are hard bias with -25 volts.
The amp is a great performer & as good as a pair of PP 45s I built on the same chassis with top of line MQ pinstripe audio iron. That 'as good as PP 45s' should not be, but the 6V6 triode amp is just a freak performer. NOS 45s cost $100 each & NOS 7C5s cost $5 each.
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