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Old 13th December 2005, 01:51 PM   #1
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Default Carver Phono

Hello,

can anybody help with a schematic of the Sunfire Phono Modul
or sunfire complete Tube preamp.

Reinhard
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Old 13th December 2005, 03:48 PM   #2
anatech is offline anatech  Canada
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Now that I'd like to see also! The only Carver products using tubes I know of are the C-19 pre, SDA-390t and SDA-490t CD players, aside from the large tube amps.

-Chris
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Old 14th December 2005, 03:02 AM   #3
Enzo is offline Enzo  United States
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Did you try contacting the company?
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Old 14th December 2005, 08:25 AM   #4
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Default Carver Phono

Have asked the german distributor:

We are not pocessing schematics, bla, bla, bla.

Will ask Sunfire in WA, USA.

Reinhard
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Old 16th December 2005, 01:40 PM   #5
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Default sunfire

Have asked Sunfire via fax,

Answer by e-mail, they told me that I need a transformer and other parts to run the phono module as stand alone phono.

No schematic.

there are to many reinventors of the light, the fire and the wheel out there, ha ha.

Reinhard

Every schematic info is welcome!
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Old 16th December 2005, 02:04 PM   #6
anatech is offline anatech  Canada
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Hi reinhard,
There are schematics for that, how would they repair one?? It can be reverse engineered, but that's a long process.

Ask them how they would repair it if yours failed... If they ask, tell them you want to design a proper power supply. Of course, the schematic may be part of the Sunfire preamp schematic set.

-Chris
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Old 16th December 2005, 05:36 PM   #7
kevinkr is offline kevinkr  United States
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Unfortunately it's called IP (Intellectual Property) Rights and some manufacturers feel that sharing schematics is tantamount to inviting someone to copy their design. (And it may be.) Others quite openly share their schematics, it is a matter of corporate (or proprietor) philosophy and companies that have the wherewithal to protect their rights under copyright law sometimes are more likely to share information.

You might try to purchase a service manual for the pre-amplifier, that if available would have a schematic.

Otherwise you might try identifying the various power connections, and decoupling cap voltage values will give you some clue as to the supply voltage. (arbitrarily say 75% of rating ) Filament voltages are usually pretty obvious by inspecting tube types used and how they are interconnected.

I somehow doubt the sunfire phono is very sophisticated, the power amplifier I have seen and worked on was booringly conventional in every respect.

Kevin

edit: fixed typo
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Old 16th December 2005, 06:40 PM   #8
anatech is offline anatech  Canada
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Hi Kevin,
Some manufacturers go overboard on the IP thing. Bryston used to be like that. They went nuts after I traced out the 4B 'cause they would not supply a schematic. My response to Brian was that the amp was no secret as soon as they sold the first one. Look at how they've changed!

Bob Carver isn't generally like that. He has historically allowed access to schematics. As a former Carver service center, we got everything. Interestingly, we had access to preliminary schematics as well. The engineering staff was available to us on top of that. If his current staff is anything like his original gang, they will be helpful and forth coming. As an outsider (outside his service network) there may be some resistance, you just have to maybe ask the right question.

-Chris
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Old 16th December 2005, 07:55 PM   #9
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Default schematic

Intellectual Property is on side, the other is good and not expensive repair in foreign countries, say europe.

This year I had o draw my own schematic of the audio portion of the Aesthetix IO. Customer has paid for that.

If you look into the designs, nothing new under the sun, so why not provide a schematic?

Reinhard
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Old 16th December 2005, 08:01 PM   #10
anatech is offline anatech  Canada
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Hi Reinhard,
I agree with you in principle. But, you can count on Bob Carver to do something interesting. Interesting only if you have the schematic. I charged the Bryston customer with the customer's consent.

Still, service agents expect service information. It's the only way to ensure a proper repair. Or at least have the chance of a repair.

-Chris
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