tube upgrade for first sound

Give it a month so that you really get to know the sound of the broken in unit before you start experimenting.

The only upgrade I have tried is the Siemens Gold Pin 7308, which
sounds superb to me. It's what Emmanuel Go of First Sound
recommended to me and is definitely one to try if you can find it. But
they are hard to find and expensive, so I'd be very curious to know of
good alternatives.

I can't hear the difference either, and there's the POV that half of all recordings are inverted anyway. But I have my speakeer leads reversed at the amp just the same as Emmannuel Go is quite insistent about this.

And Paul, as many have mentioned, plug it straight into the wall. After a while, you will want to play with aftermarket power cords.

Discharge button? Is that new?

Yeah, the $75 minimum was a shocker. So I ordered two sets of OA2's (in case I keep the First Sound forever) plus the EH 6922's and thereby met the minimum. But there must be another source for OA2's, and Music Direct sells the EH tubes for less than New Sensor does. I just wanted to get it over with. Emmanuel recommended the Russian OA2's that New Sensor sells on the basis of reliability (not sonics) vs. other OA2's.

One of the OA2's in my FS went out, so when I ordered replacements from New Sensor yesterday, I also ordered a pair of the EH Gold Pin 6922, which Emmanuel suggested I try. Not NOS and less than $30. I forget if this tube has been discussed here. Has anyone tried it?

By the way, the only reason I knew that the OA2 went out is that I happened to peak through the side vents and did not see the blue glow on one side. Of course, it *seemed* like things weren't sounding quite right, but the preamp definitely still worked even without the functioning regulator tube.

>I already picked up a Mini Khan power cord for after break in! :-)

And you thought tubes were expensive!

I'm having the exact same problerm with a new pair of EH6922's. Sometimes
tubes go bad well before their time, I guess. Maddening.

I'm almost certain it can't be the OA2, which is not in the signal path and thus
can't create the kind of distortion you (we) are hearing.

Stock is 6H23n? And it went bad in the first month?

Has anyone else tried the Electro Harmonix Gold 6922?

I've also gone through two sets of the EH tubes. But I want to know why they are not working.

Oh, has anyone tried Walker SST on their FS? Just curious.