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Old 11th January 2003, 03:39 PM   #1
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Default BOSOZ 2 tube power

So I really like the sound of the BOSOZ but I also like the ambience of my old ST70 in the bedroom. (kinda like a bedroom fireplace). I'm just a tag along with no design capability yet, but I would like to rebuild the front end of the ST70 to accept balanced input. Does anyone have any design suggestions? X-tube maybe?
Thanks
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Old 11th January 2003, 08:02 PM   #2
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The way I have choose is the transformer one, I mean I use
input transformer in front of input stage of my tube amp
and connected in balanced mode to my BalZen, it works pretty fine.
and sounds good too. Have a look at Lundhal or Sowter and you will
find the transformers you need.
- 10k /10k, 1:1, and a 10k res. connected to the secondary should be a good option.

friendly

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Old 11th January 2003, 08:18 PM   #3
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Default Input transformer

Thanks Flyinfader,
That's a solution I've considered and might come back to, but in the meantime, if I'm going to spend some money, I'd like to think about something different. I think it was Carpenter that said in a post that appyling X to a tube amp was not so difficult.
I'll be out till late Sunday so thanks for any replies till then.
Charles BL
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Old 12th January 2003, 10:09 PM   #4
Coulomb is offline Coulomb  England
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Try matching the SOBOZ to this beauty, that's what I am up to anyway.

http://web.vip.hr/pcb-design.vip/zen-hyb.html

Anthony
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Old 13th January 2003, 12:29 AM   #5
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Default Tube Zen

Anthony,
Tube and mosfet, is that tube zen or Yin Yang? I have'nt done Zen yet so your project might be right for another room. In the meantime, I'm thinking of this driver... as shown on the vacuum state page. But I wonder if it can be x'd?
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Old 13th January 2003, 08:19 AM   #6
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Quote:
Originally posted by flyingfader
transformers you need.
- 10k /10k, 1:1, and a 10k res. connected to the secondary should be a good option.
Here is an almost zero budget input trannie that has gotten good reviews on the JoeList. Follow it with a differential driver stage and away you go.

dave
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Old 13th January 2003, 12:03 PM   #7
protos is offline protos  Greece
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How about the other way around. Can somebody design a BOSOZ with tubes ? I imagine it should be quite easy.That way you can power an Aleph in the balanced mode which is best. I haven't really researched thoroughly but most tube pre-amps seem to be unbalanced.
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Old 14th January 2003, 02:31 AM   #8
Coulomb is offline Coulomb  England
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Quote:
Originally posted by protos
How about the other way around. Can somebody design a BOSOZ with tubes ? I imagine it should be quite easy.That way you can power an Aleph in the balanced mode which is best. I haven't really researched thoroughly but most tube pre-amps seem to be unbalanced.
Not sure if this fits the bill,

http://web.vip.hr/pcb-design.vip/6c33c-b.html

Anthony
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Old 14th January 2003, 02:42 AM   #9
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Default Input Tranny

Dave,
That looks like a great deal, definitely made my favorites list.
Charles
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Old 14th January 2003, 11:20 AM   #10
protos is offline protos  Greece
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Hi Anthony,

It doesn't seem to be balanced at all to me or am I missing something?
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