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vdi_nenna 12th September 2001 07:30 PM

Can The Bride of Zen Preamp drive 32 ohm headphones safely?

paulb 13th September 2001 02:50 AM

Depends what you mean by safe. But it wouldn't be useful; it's a higher impedance output (1.5K volume pot at the output).
You could use the original Zen or the SOZ. Or you could try some of the excellent designs at:

vdi_nenna 13th September 2001 03:15 AM

Thanks, I saw Headwiz earlier today. I like the first single ended design on there. Real simple. Probably get all the parts at Radio Shack and build it in one night.

I have a 5k pot at the out of my BOZ, but that doesn't make it any more compatible.



GRollins 13th September 2001 03:47 AM

You could always cheat and put the pot at the input, like ordinary preamps...


vdi_nenna 13th September 2001 03:56 AM

I could easily do that. Then just make a connector for the output to the HeadPhones.

I haven't listened to a hi resolution system in about 4 months. I'm going bonkers.


rickcr42 13th September 2001 04:17 AM

go with the Szekeres MOSFET amp at thew HeadWize site , real nice with Grado cans

paulb 13th September 2001 04:24 AM

How about feed the BOZ into the Szekeres? If you need gain.

rickcr42 13th September 2001 04:35 AM

funny you ask that-I use the BOZ as my preamp and I have three outputs on it
1-record output from the input selector
2-normal output from volume control to amp
3-pre volume control output
My headphone amp has two switchable inputs,input one is from the rec out,input two is from the pre volume control output.I use this due to my headphone amp having its own volume control,and use the BOZ gain only on sources with not enough gain to drive the amp using the rec out

[Edited by rickcr42 on 09-12-2001 at 11:37 PM]

paulb 13th September 2001 04:48 AM

Good idea, switch out the gain stage if you don't need it. Have you tried using your outputs 1 and 2 with the volume set to produce a gain of 1 so as to A/B test the BOZ? I always wondered if the great sound of the Zen series was because they added some distortion. Does it by any chance sound better with the BOZ in circuit?

rickcr42 13th September 2001 03:34 PM

Both the BOZ and Szekeres amp use the IRF510 mosfet so have similiar sound,but remember,the BOZ operates in the inverting mode as does the ZEN amp.That means the pair produces a non-inverting signal when used together but when used with a non inverting following stage you will end up with an invrerted signal.The szekeres follower is NON inverting so the result is an invertied signal.

The sound-different in combination but not necessarily wrong.Who knows what the phase is of the recording (how many inverting stages used in the signal chain ?).On some material the difference is like going from an active preamp to a passive line stage , more dynamic and punchy.Is it distortion ? No clue,but sounds good to my ears and that is the bottom line.Some do not like the "MOSFET" sound.When used in Class-A it suits my musical taste like nothing else does.Just my opinion


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