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Old 3rd April 2007, 12:17 PM   #31
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This is the amp, Phass RE-2. It uses exotic components, like Jensen output transformer, Sony FETs.

Here, we got a member Rozak that is successfull making this kind of amp (transformer coupled).
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Old 3rd April 2007, 01:11 PM   #32
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ahh, thanks anyway. I am curious about this because I would like to try some high-voltage MOSFETs in place of tubes in a push-pull fashion...and this was quite close.
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Old 3rd April 2007, 01:22 PM   #33
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You can search username Rozak, and see his posts about this amp configuration.
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Old 3rd April 2007, 01:25 PM   #34
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One topology that does work well is where you have a single output transformer with two identical centre-tapped windings. One winding goes from drain to drain with the CT to positive supply rail, the other winding (reversed in phase) goes from source to source with the CT going to earth. Then optionally (but preferably) put a pair of large capacitors e.g. several thousand uF from one drain to the opposite source and vice versa. The speaker is connected from source to source, or from drain to drain, whatever you prefer.

This is an absolutely rock-solid way of making an amp and it is basically an emitter follower so distortion is low and it only needs n-channel devices. Further, the transformer does =not= need to have good audio quality at all. The thread is here
Most of the old timers here would have heard me blab on about it before, but if you haven't it's definitely worth a look. It can easily be scaled up to a seriously big amp.
Best-ever T/S parameter spreadsheet.
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Old 3rd April 2007, 02:14 PM   #35
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Originally posted by lumanauw
Hi, all,
Pafi, you seems to understand much about tranformer. How can I calculate minimum requirement (minimum inductance or resistance) for the ZEN V7-T? Mr Pass himself does not touch this in his article (can be seen in Passdiy). He just use ordinary 120V+120V of 300VA primaries. If I want to DIY this load CT inductance, not using power transformer primaries, how can I calculate the requirement (toward voltage and speaker load)? What will be the number of turns and sizes of the magnet wire?

For 20Hz into 8 ohms you will need 80mH.

Everything is do the impossible just takes a little while longer.
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