Tekton Double Impacts

Hi Aric,
I can see the advantages of a parallel SET (PSET) design. One issue I’ve seen raised concerning this parallel configuration is maintaining equal power sharing from each tube in the pair. Apparently there’s a tendency for one of the tubes to become dominant and the other tube provides lesspower/current output.

Audio Note has been making PSETs for a long time and I assume that they have solved this problem. It seems that some other PSETs perhaps not. PSET 2A3 or 300b would seem a very good fit with the Double Impact/SE. 
Charles

After listening to the KT 150's for a few hours I put the KT 88's back in and the KT 88's are much more to my liking. The KT 150's provided a very big sound with extended highs ( too much so for me) but lacked the sweet midrange and overall musicality that the KT 88's provide in Aric's amp. That makes me wonder just how much more midrange magic a 2A3 or 300B SET from Aric would offer. The Transcend amp is my fav of all the amps I've owned and very much remind me of the sound achieved when Charles brought his Frankensteins over. I can't say that the Transcend is as good as the Frankensteins as its been a while since they were here but it brings about the same sense of realism in music that I remember the Frankensteins providing. That's saying a lot for Aric's amp! Suffice it to say I'm VERY happy with Aric's amp and it makes a great pairing with the DI's......and I'm sure it will with the SE's also. Time will tell. 

@charles1dad  It would seem similar to the issues when doing push pull in that one tube will either be pushing or pulling harder than the other. One way to avoid this is using matched tubes, or to have a variable bias for each tube (instead of a balancing pot used in many push pull design). However I do see that using closely matched tubes would help, although once they burn in their specs will drift somewhat and not always in the same way. By having a separate bias adjust for each tube you could fine tune the current each one is drawing. One drawback however to parallel SE is the double current requirements for filaments and the high voltage requirements. Best, Aric

@sbayne The 6B4G does not seem hard to work with. It would appear to require a bit more of a swing at the grid to drive to full output than say a 2A3, but isn't anything difficult to achieve. It also requires similar voltages and output transformer. As far as keeping the amp quiet (hum free), following good grounding and chassis isolation techniques as well as a choke-filtered power supply should keep it silent. I don't have hum issues with any of my single ended amplifiers after learning good layout and grounding techniques. Aric

Aric, 
Thanks for the reply.  Yes,  eventual "drifting"-of matched tubes was the concern. Your solution of having separate bias control for each output tube seems as though it would solve that problem. Aric regarding hum  are you a proponent of DC heating versus AC heating in low power SETs  or is either acceptable to you?
Charles