Preamp Deal of the Century

It has been my experience that the regulators affect the sound much more than any of the 6SN7's. Yes, the WE 350B's are very expensive, but worth it, IMHO. The Genelex KT66's aren't even close to the WE's in my system. Since I have the 350B's, I haven't tried the 6F6's.

As far as the 6SN7's go, I have tried them all. The EH 6SN7's kicked out the Kenrad blackglass and Tungsol roundplates. Still have the Kenrads and the Tungsols, but they are sitting in a box. The EH's are just as good as the 'Rads and Tungsols and better than everything else.

It is my opinion that in most any other application the Kenrads and Tungsols would probably best the EH's, but I simply believe the 6SN7's contribute very little to the sound in the Supratek as compared to the regulators and the rectifier. Having rolled them all, I wish I had saved a bunch of monney on NOS 6SN7's and bought the EH's in the first place. Taking the money I wasted on NOS 6SN7's, I could have bought 3 pairs of WE350B's which do greatly affect the sound of MY Supratek.

Not trying to argue with Ecclectique, just offering a different experience.

Fiddler, thanks for your perspective. It is very much appreciated. You have tried so many tubes on your Supratek. My Syrah has a pair of matched GE side getter 6SN7s. I may buy the EH for a spare and try them in January. Best,
frankiealverti

Hello ecclectique, big disappointment. The GZ-34 did not solve the problem. On the contrary, with it in place of the Mullard GZ-37 the funny sounds began just a couple of minutes after begin of vinyl play... The GZ-34 is a Valvo with Mullard codes, not a Hytron. The seller wrote it measures good on his Funke tube tester. Any idea what else it could be? Thanks.
Regards,
frankiealverti

Ecclectique, thanks for your inputs. the 6bg6 tubes have a hat with wire on the top of it. Should i change it?

I experience lately with my system and i do not know that it is normal or not. When my JC1 is in stand by mode, i turn syrah on and the speaker produces no noise, boom.... But when the Amp is in the play mode and i turn on my syrah i hear the sound of boom from the speaker especially the woofer. IS there any wrong in my system?

Thanks and Happy Holidays

Hi Houstonreef. OK,things are a little more clear now. As I mentioned in my last post the 6bg6 is an electrical equivalent to a 6L6 however it requires a top hat connection to the contact on top of the tube to power it up. Could very well be a factory version from Supratek for all I know. I would suggest you email Supratek and ask Mick if he made it that way or perhaps you could ask the previous owner if he rewired the socket to accomodate the 6BG6 tube. To be candid here: Unless you are into tube rolling of the regulator tubes it nothing to be concerned with anyway. RE: Power up procedure [important]. When the JC-1 is in "standby mode" there is no voltage or power at it's output whereby you can leave it powered up 24/7 if you wish.It is very important to be sure the preamp is powered up and running PRIOR to switching the amplifier from standby and into PLAY MODE . Powering up the preamp when the amplifier is in play mode can potentially damage your speakers, amplifier or both. When shutting your system down.....It is imperative to turn off the amplifier first before the preamp. In your case, switch the amplifier out of play mode and back to standby mode before powering down the preamp. You can leave the JC-1 in standby mode 24/7 if you wish.