Different tubes do make a difference!

I can't answer your question, but would it have killed you to put the brand names of the original set of outputs and the replacement set you installed, or the amp you're using?

Also, did you bias the new tubes properly? If they're running too cold they'll sound like crap.

I never heard much difference between brands of EL34s, 6CA7s, and even 8417s I've used in my vintage Fisher integrated amp. They all sounded fine until they became flabby with age.

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• It ain't a Q - it's a troll.

but would it have killed you to put the brand names of the original set of outputs and the replacement set you installed, or the amp you're using?

** Nowadays, there are only two kinds of *new* EL34s, Chinese and Russian.

The former suck while the latter are mostly OK.

** Happens to people too....

... Phil

Yeah, I almost had a heart attack when I tried posting the name brands. But I'm not the type who gives up easily. The better sounding tubes are Psvane brand tubes. The worse sounding tubes are Electro-Harmonics. Oh crap! My heart! Call 911! This is the amp:

The amp has no bias adjustment. I know that different circuits are used for adjustable bias and auto bias. Could it really make that big of a difference? Should I consider modding the circuit so that the bias is adjustable? Thanks, Eric

Yes

--
"I am a river to my people." 
Jeff-1.0 
WA6FWi 
http:foxsmercantile.com

and names of the original set of outputs and the replacement set you instal led, or the amp you're using?

they'll sound like crap.

417s I've used in my vintage Fisher integrated amp. They all sounded fine until they became flabby with age.

How did you know I was being literal?

I've used EH EL34s and the 6CA7s in my audio amps and guitar amps, and I th ought they were as good as a set of NOS Sylvania 6CA7s I keep on hand. Not to pick on your amp, but I'm not sure that amp is the right device to crit ique vacuum tubes/valves. Also, I've never listened to (or even seen) a si ngle ended EL34 amp.

I've never actually owned any EL34 amp that was auto bias, so I never compa red them. I do know that if you manually bias the outputs too cold, they b ecome class B and sound like crap, which is why I asked. I bias my guitar amp a little hotter than design spec, and my vintage audio amps just a bit on the cool side, and they sound great, but I do rebias them every few mont hs.

Before modding your amp, I would measure the cathode current and see where the tube is running. You should be running close to but not over 100% plate dissipation of the tube you are using. You may have to replace your cathod e resistors to get there.

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** That is a pile of Chinese "audiophool bait".

Cheap and very nasty, a lo-fi joke.

Like I already said - your post is a troll.

Like all the others you ever posted.

.... Phil

I would be inclined to call the Drongo from Down-Under the only troll here - but that would require it to have magical powers, live in a mountain and steal maidens - all beyond the capacity of this creature.

Peter Wieck Melrose Park, PA