|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
|
|
Tubes Asylum Questions about tubes and gear that glows. FAQ |
|
In Reply to: Mixing output tubes in a Manley Stingray. posted by haziz on March 19, 2006 at 08:29:22:
You can temporarily sub in any output tube that works and biases up properly to keep ya going. When your complete sets arrive, stick with the batch sets. Even though there is adjustable bias for each tube, we have found best performance when all 8 output tubes are pre-batched and yes, of the same manufacture. The only way you should mix brands/types would be if you had equal opposing push-and-pull pairs installed. In the Stingray, tubes 1&2 are one phase and 3&4 are the other phase for that channel. On the other channel 5&6 work together and 7&8 work together on the other phase. In the case you had to mix brand/manufacture, like in an emergency situation, (or I guess you could play with this to see what happens) I would install one type in all the odd tubes and the other type in the even numbered output tubes. Ei's and the NOS EL84M - 6Pi14Pi-EB RUSSIAN tubes are similar in the general current draw operating parameter department.I have observed in my brief history with them that the JJ's (and the regular russian EL84 (not M)) generally require slightly more negative bias volts to hold them down in the Stingray unless you have gotten them preselected for similar current draw/negative bias volts to where the Ei or EL84M/6Pi14 types generally fall. So if you had changed/lowered the Master Bias Resistor for the JJ's you'll need to change it back for the Ei or NOS Russian EL84M. Or if you had lower current draw JJs and did not have to change out the MBR, then just rebias when you get the new tube sets in there.
General concensus is the Ei's are the best choice for the Stingray. The russian EL84M 6Pi14Pi-EB are strong tubes. We use those in the MAHIs.
As for currently manufactured 12AT7 types, the Ei has the most votes for best sound in that amp. As for other NOS exotica, we cannot acquire enough GOOD NOS 12AT7s to base production on, (hated those mid-80's Philips and GE's) so a good guy like Kevin Deal at upscaleaudio.com is a super source for delivering interesting cool old tubes to play with for those who want to play with input tubes.
The 6414 driver tubes we use ARE NOS. We seem to be running low on the giant batch GE or Raytheon's we have been using for over ten years and have now moved on to another huge batch of NOS 6414W GE we have in stock. Nobody has reported any sonic difference on this. I would just leave the driver tubes alone.
--
Cheers, EveAnna Manley
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Mixing output tubes in a Manley Stingray. - Vanimal Manley 09:09:58 03/29/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
