Tekton Double Impacts

Kenny, please let us know where you end up on the tube amp build. I would love to build a 2a3 amp just the way you are going about it. I would choose the same 6sn7 and SS rectification. 

Now I just need speakers that mate well with the 3 watts! That is a very cool aspect of the DI speaker. I would usually use my Lyndorf and sometimes put the 2a3 into service.  Fun stuff! 

mac48025

The Pioneer M-22 runs quite hot. I can touch the heatsinks but I can't leave my hands on them for very long.

The amp is 6" tall and I have it in an 8" space on my rack. The rack is open on all four sides so I think the ventilation's is fine with 2" of space above it.

@kdude66 

Yes, 30 watts of Class A power seems to be enough. I still have my doubts about 1 watt though! If I put my Freya preamp in JFET mode (tubes bypassed, no gain), I can crank the volume all the way up and it is not painful. It's louder than I would listen to, but not way too loud. The tube gain mode provides 14dB of gain. Vidar has 27dB of gain. I am not sure how much gain the M-22 has. I can't find that spec anywhere and I don't know how to measure it myself.

The more I read about the Pioneer M-22, the more I find that it was considered one of the best amps of it's time and is still considered a phenomenal amp. Based on my experience with it and the DI's, I have to agree. There seems to be a nice synergy there.

Bullitt:
So far no water in the house. We are pretty far North. How about yourself?

grannyring,

Yes I will keep you updated with the 2a3 build and prices.

porscheracer,

If my memory is correct,
The m22 has about 23db of voltage gain which is only 3db lwr than most SS amps at 26db.It's been a long time since I had mine.

You probably will be just fine running it in your rack as long as all 4 sides are open.You should be able to touch the heatsinks for at least 5 seconds and not be too painful.It would be nice if you had more height than 2 inches if possible.

The M22 has extremely low distortion and a very good signal to noise ratio of 106.Very impressive specs back in 1976.Being a pure class A push pull design it probably draws about 240 watts from the wall anytime it's on even with no music playing.

Most of the original M22 and M25 amps found there way to Asia because they are highly collectible.

I know we covered this 1 watt subject before,I find my MZ2S quite good sounding by itself with simple acoustic jazz and vocal music but It's not enough for really rocking out or full Orchestra music at realistic levels.

I can say also that it's one heck of a great sounding headphone amp but I don't even own any and had to borrow a pair to find out.

Probably at your loudest listening I doubt that you are using more than 8 to 10 watts with the M22 and your Di speakers.

Enjoy that music,
Kenny.

Kdude66 8-27-2017
If my memory is correct,
The m22 has about 23db of voltage gain which is only 3db lwr than most SS amps at 26db.It’s been a long time since I had mine....

The M22 has extremely low distortion and a very good signal to noise ratio of 106.Very impressive specs back in 1976.Being a pure class A push pull design it probably draws about 240 watts from the wall anytime it’s on even with no music playing.

Kenny, your memory is truly exceptional :-)

Specs for the M-22 that are provided at HiFiEngine.com indicate 1 volt sensitivity and a power rating of 30 watts into 8 ohms. Those numbers correspond to a gain of 23.8 db!

Also, the service manual (which can be viewed at HiFiEngine.com if one is registered there) indicates a power consumption of 280 watts, and "hum and noise" under certain specified conditions of -106 db!

Best regards,
-- Al