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Message started by Alan Arkin on 03/16/26 at 15:20:19

Title: 6922 Tubes
Post by Alan Arkin on 03/16/26 at 15:20:19

Happy Monday!

In the never ending stream of upgrades, I am now thinking about rolling the input tubes in my Rachael. I started with some military spec 6N1P-EVs and then moved on to some 6922s initially to extract some more gain out of the amp.

I am now thinking about upgrading the 6922s to some Amperex 6922/7308s -- probably Bugle Boys or Orange Globes -- or maybe some Mullard E88CCs. I don't really want to add any brightness to the system, I probably add a little bit more warmth as I think that the switch of my step up to the Cinemag 1254s added detail but maybe less warmth.

Thanks!

Alan

Title: Re: 6922 Tubes
Post by CAJames on 03/16/26 at 15:50:52

If you're looking for "warm" in my opinion you should look a Mullard. The conventional wisdom is UK tubes lean somewhat warmer than others. I don't have a Racheal but in my UFO25s I like the PCC88s better than 6922/ECC88s. And the Mullard PCC88s have a bit of warmth without sacrificing detail and speed. The Amperex 7308s are fabulous, but in my experience more neutral and transparent rather than warm.

Of course there is synergy between the input tubes, power tubes and rectifier. So a lot of times changing more than just one position will affect the sound in a way that is greater than the sum of the parts.

Title: Re: 6922 Tubes
Post by JHC on 03/16/26 at 16:59:52

I have some medical grade Amperex 6922 tubes that I procured from Brent Jessee and I really like them, although I would not say they are super warm. I also picked up some Voskhod Rocket Silver Sheild 6N23Ps on ebay for a fraction of the cost. To my ears, they are very, very close. The Rockets are not quiet as smooth, but if you can find some, they are worth checking out, especially for the price. To my ears and in my system, at least.