SET Shootout China VS The USA

The 6C33C-B tube, when someone includes an amp using this bottle, THEN you will have my undivided attention, hah. Sorry all, I’m just a parrot! :) ~~~~~~~~~~~~~~~~~~~~~~~~~~ Well this tube ain't too shabby either. 

 

 

Mozart fan what kind of a crap system is that. LOL

I own a parallel single-ended 2a3 amp; the two tubes are not in antiphase (pushpull) configuration.  Parallel single-ended puts out more power, and because  parallel operation reduces output impedance, the turn ratio of the output transformer can be reduced.  But, it is quite hard to get good balance in output from the tubes, and one ends up doing most of the work after a while.  I had that happen with my amp.

There is no practical way for an amp to be switchable between single-ended and pushpull operation, the circuits are fundamentally different and the output transformers must be different in design to optimize performance.

it is so unclear as to what is being compared here except that it is two different amps.

 

Hey Larry, I'll run by, your ideas over with my tech, see whats going on.

OK Acresverde mentioned a  FR system w/o woofer may not appeal to other audiophiles whose music requires a  deeper bass response.

WEll with a  PP type  SET, maybe this will azllow adding a  woofer in the system. But not sure if the added ohm will  be too much on the 2A3's.

I was running dual 8 ohms FR + 8 ohm tweeter,,and 1 of the UX250's went dark, and  is new stock. 

Have to get  with my tech who built the amp, perhaps its not the ohm over load, maybe something other.

But this is what I have to consider here.

can a  2A3 tube handle dual FR + dual tweeters..is this asking too much.

Although the  center trans on the UX250 was not running hot with 3 8 ohm drivers,, maybe the tube was being over loaded.

So its possible  my dual FR speaker may not work with a  SET,,or perhaps this 2 tubes per channel, PP design allows for more ohm load.

hard to say at this point.

My tech even mentioned **yeah go ahead and put a  single W18 mid along with the system..**,, Saying it can handle the ohm load.

All this has to be  worked out. Good thing in this testing is that if a  stock tube goes dark, no big loss. 

I will run the stock tubes for 6 months witha  dual FR, dual tweter, thats 8 phms x4,, and see how the tubes hold up, /heat on center trans.

BEFORE I order Psvane ACME 2A3's which I would not wish to risk early burn out at 600/pair.

If there is trouble, we can try a  single FR/tweeter and use this  amp as for light chamber.

More complex big orchestra like Schnittke symphonies, we can run the Defy  which can easily handle a  bunch of drivers. 

Back to the idea that 2 tubes per channel offers a  better sound vs the Defy's 6. With 6 tubes, you have a  beefier  trans , opening up the path for dual FR + dual tweeters and a  woofer for techno , heavy metal, grunge and any other slam driver music you  care to hear.

So sems  there is a  place for PP power. 

All these things have to be tested and worked out.

Stay tuned.....

Side note the Defy has 2 ohms on top of trans, but somewhere I read , the amp needs to be adjusted to bring it to 2 ohms. 

My tech does not want to make any mods in this circuit.

Again, what may happen  with dual FR + dual tweeters is over load not so much on the center trans, but  may affect/shorten the life of the 12 KT88's, which is not a  good thing, 12 tubes runs me $600. 

Stay tuned.....