If an amp runs tubes hard, the tube can go thermo and red-pate, which can take out a lot of internal parts. I have seen this happen, blowing up not only the fuses, but caps and resistors and even chokes. I had it happen more than once on Cary gear (with all the parts mentioned), and is half the reason I let them go. The other half is that DHTs sounded better...
Dont get me wrong, the did sound pretty good tho. As my tech said, "guitar amps always sound the best right before they blow".
Another opinion I have noted is that overbiased tubes sound grainy??
Last edited by mah; May 17th, 2013 at 06:49 AM.
Opinion is only as valid as its verifiable supporting evidence.
A big 2nd to that.Originally Posted by Altec Best
Lose everything "white" out of your diet.
Not all vegetables make good leaders.
Tell me more about the PSVane toobs. Anyone know if the low cost line parts are tough? I lost 2 more Svets and am down to mono at this point.
I need to put a soft start on the B+, when I turn my amps on, the filament being long and poorly supported moves twords the plate as it warms and poof, fil to grid short and lot's of sparks.
On the lipids, I took part in a med study, had my total number below 100. When the study ended, tried Lipitor, and it elevated creatine leves, not good. So diet for me, and I'm at the high end of the acceptable range, and it aint going lower. My doc does not recomment meds. so whatever, statins help a lot of folks, they also kill a few as well.
Ron
Enjoying Altec Speakers since 1972
I bought the low cost line for my 300B monoblocks. I need 8 total so $300 ea was not in the cards for me for the primos. The HiFi ones look pretty good construction-wise:
To quote the designer of my amps: Fully 99% of the sonic characteristics reside in the design. Circuit topology controls everything. The designer manipulates inter-stage impedances, time constants, signal headroom, feedback and many other parameters to achieve a desired result.
I tend to agree with this. I'm not a believer in designer caps, argon treated wire or any other audio hocus-pocus. I believe in a well designed circuit that will perform properly with a reasonable range of component tolerances.
I got matched quads for my new project, but he says that's not even necessary.
Last edited by alancohen; May 30th, 2013 at 05:52 AM.
With a properly designed output stage, I believe the input and driver tubes make more of a difference. I've been called a liar a cheat and a scoundrel, so save your breath. To me, the input tube sets the stage for what happens in the whole amp. Change output tubes and go "wow, I never heard that before". Change input tubes and say " Wow, my amp sounds completely different". Subtle but significantly different.
Output tubes are pretty much locked in by the O/P tranny and available voltage/current. The sound doesn't change that much, just the power available.
But you haven't tried them out yet correct?
FWIW, I'm the designer of my amps. I'd post the schematic, but I wouldn't be able to bear the ridecule....... :-)
Ron
Enjoying Altec Speakers since 1972
Nope. I just got an email from Bruce with a tracking number. They're on the way. I have serial # 000000001.
And I aspire to one day know enough to laugh at your designs, although i'm impressed by anyone that tries. I just got a combo scope, signal generator and DC PS. I want to start learning.
I agree with most of what you say. But, I have to disagree that output tubes doesnt change the sound that much.
I have (and have had) both high and low spec amps - factory built, DIY, and a Sun Audio kit thats looks pro-built with hi-spec parts. I tend to run a variety of input tubes to find that "wow" factor you speak of. Yes, "significantly different".
In all of these amps I have noticed the same "wow" and "significantly different" presentation factor when changing the output tubes.
For example, I have Svetlana and JJ I run in a low/mid spec DIY 300B amp (parts wise - but a very interesting circuit)- there is a significant difference. More "wow" with the latter than the former.
I have Sovtek, RCA and EML mesh-plate 2A3 I run in the Sun Audio amp. I get the worst sound (but not bad at all) out of the Sovtek. With the EML, well, words cannot really express how much better the music is through my 604s. "Significant" is nowhere near expressive enough.
- - - Updated - - -
http://www.diyaudio.com/forums/tubes-valves/226843-budget-300b-tubes-recommendations.html
Last edited by gortnipper; May 29th, 2013 at 11:55 PM.
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