Thanks for the tip. That Mag1515 looks like another good option to consider. Seems hard to find any opinions from anyone who's heard it, though (other than the ones he has posted on his site).

Is there something in particular about paraphase that makes you nervous about it?

Thanks for the laugh.

It would need good quality parts, and be versatile. There are a fair bit of choices. I'll mention some of the ones which stick out for me.

A Citation II would stretch your budget a bit, a pair of Heathkit W5's would land you closer to the top by the time you have restored them. A pair of Dynaco Mk.IV would allow a bit of budget to try other things when the modification starts to happen. Eico HF 50's are going to land yo near the top of your budget limit, but have good Iron and thus potential...
regards,
Douglas

1. single filament winding for the 2A3's. Not good if well centered cathodes/filaments are not available( and they are *NOT* )

2. The phase splitting is done with an autoformer. I have not liked the sound of this sort of thing in the amps I have experimented on. A grid choke, functioning like a grid choke with balanced drive has worked *MUCH* better. I had a finger in the design of the MQ device, and abandoned the project. It is good on paper and the bench, but I found its sonics lacking.

3. I think the S-230-Q is a better choice of output TX for class A PP 2A3's. 6k6 instead of 5k for the S-240. The 230 is not available from MQ though...neither is the 20-20 Plus series in this a-a load.

4. B+ is a bit on the high side for that load if Class A bias is desired. It also seems to sound better if the operating point is a bit more conservative. Certainly the finals last longer.

There is the group build forum here, if you wish to take on a project with group support.
regards,
Douglas

I think I'll see if I can't get him to upgrade his line to a big PP 300B kit, or perhaps an E-Linear EL34/6550. Good to see a means of contacting him!
regards,
Douglas