audio-talk

Time for a round-up of this thread as I think it has probably run its course now, written in a true dead boring academic stylee. :wink: First, regarding constant-current sinks and their application to differential operation of a push-pull valve output stage. One could speculate indefinitely over the...

I'll bring Armenian Death Metal.... DTB Dave If you drop off the A1M on your way, you can also pick up some Japanese Death Jazz to take to Paul's. Some of it to combine one of Nicks phrases and one of my Dad's that he nicked off George Melly, sounds like a hybrid between a drum kit being kicked dow...

Hi-thats what i have done to mine today. Reading Gerrys comments i thought i would give it a go. That,and the CCS on my 832 has given me real bass now,and not at the expense of mid and treble. I take then that you are pleased with the results of your mods to the 832A output stage of your amp Philip...

Dave :D :D :D Simon Thanks for taking time to have a listen to the amp. Nice isn't it? Since you left I had another brainwave. The Mullard EL34s were quite disappointing as constant current sinks, as you heard for yourself. I'm not sure if you remember those fat bottle EL37s Steve Shiels was kind en...

Back to the tube rolling I was loudly reminded by the missus that I had to go and pick up my daughter from work pronto so my post was rudely cut off. I would have edited it but it seems that a bit of silliness about chatting up dogs in Kent intervened whilst I was gone :D I might have known things w...

Well Simon and I had an interesting hour and a half with the Jetson, playing some of the familiar stuff heard at many of the fests.

We even got into a bit of tube rolling of the pentode CCS valves on the output stage: very interesting indeed.


Steve.

Well myself, Philip and Greg are on a sticky wicket to begin with with this push pull malarkey.

As for you with the Nelson Pass SS stuff... well there's no hope of redemption unless you publicly renounce this blasphemous heresy.

Steve

There seems to be a lot of conjecture here, even dare I say it, prejudice...I was going to say that this might lead to agreement and the mutual backslapping.....but in my sloth to reply I think Nick has already said it... :wink: Well of course it's conjecture Ed. Nobody can prove that any of this i...

pre65 wrote:Hi-wait and see indeed !

PS Steve,its an 832A valve !

Well.........you know what I mean.

My brain has been wrecked by all the calculating with those damn EL34s

Steve

Nick wrote:Good point, I think we are all saying much the same thing. Odd, isn't it, people on a forum agreeing with each other. Whatever next /

Not when you are a pathetic bunch of backslappers like us

oops got a bit political there.......... In joke on here Stephen.... sorry

Steve

Stephen: I think the thing is that the CCSs I'm using are being used exactly where it is an acknowledged advantage to apply them; ie in the tail of a differential pair. These of course tend to be used mainly in PP amps, where arguably the PSU has a bit less of an influence on the sound of an amp tha...

I wonder - I like the idea that CCS is good for small currents then. your el34 Steve, blows that out of the water I know but the Rankin amp's ecl82 pentode section is still handling a very small current because 45 doesn't need much. Ah yes.........but what I meant was that in an output stage where ...

Hi Nick See the edit above that I did to my post, at the same time as you were composing your reply. There's possibly a bit more evidence of the synergy you allude to in there though I can't prove any of what I'm positing. Using a power pentode to provide a CCS in an output stage might work far bett...

could do CCS on the output pairs but I very much do not want want to. Bloody solid state! - goes against the philosophy of it all and I think it (can, very easily, much too easily) degrades the sound. TBH that's what I thought could happen with too many transistors, which is why I decided in the en...

I look forward to hearing it some time. TBH, when I heard it at Steves (minus CCS), what was obvious (at least to me, maybe I was wrong), was a characteristic that I hear with most push pull amps, a sort of curdleing and thickening of the sound in the mid range, not sure if that description makes s...