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Old 8th June 2004, 04:20 PM   #1
sv62 is offline sv62  Philippines
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Default tube rectified preamp schematic

Pls. recommend an ideal schematic for a tube rectified preamp (line stage only) that should work very good with rotel 1075 ss amp. They say a foreplay circuit should work fine but i dont have the circuitly. Would appreciate your help? Thanks alot!
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Old 9th June 2004, 01:03 AM   #2
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The Foreplay is relatively high gain. SS power amps "typically" have a sensitivity of less than 2 V. for full power. That means the O/P of a CDP will drive the amp into clipping. So, you need a buffered volume control with approx. unity gain.

A "simple" cathode follower fills the requirement. A thread discussing this subject appeared on this "board" quite recently.
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Old 9th June 2004, 01:13 AM   #3
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Hi,

Quote:
A thread discussing this subject appeared on this "board" quite recently.
This one you mean?

GAVIN'S 5687 FOLLOWER

A little bit of self-promotion never hurt anyone...so:

TUBE RECTUMFRIER A LA RIGUEUR...

The linestage is a White Cathode Follower preceded by a volume control...
That one can drive a SS amp input impedance and a mile of I/C cable...so to speak...Just what the doctor ordered.

Cheers,
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Old 9th June 2004, 05:54 AM   #4
sv62 is offline sv62  Philippines
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Will the 5687 schematic be advisable on this pairing?
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Old 10th June 2004, 12:56 AM   #5
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Hi,

Quote:
Will the 5687 schematic be advisable on this pairing?
Yes, quite likely it will do fine BUT....as it uses a dual rail supply AND you want to use a tube rectified supply, you'll now either a CT xfmr with FW rectification or use a FWB using vacuum diodes with a single ended xfmr.

Cheers,
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Old 10th June 2004, 12:56 AM   #6
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Quote:
Originally posted by sv62
Will the 5687 schematic be advisable on this pairing?
If you have a SS amp with a high sensitivity input then it will be perfect.
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Old 10th June 2004, 01:42 AM   #7
sv62 is offline sv62  Philippines
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Thanks guys! Based on ur recommndations, anybody out there wants to share the schematics?
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Old 10th June 2004, 06:40 AM   #8
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Here's a new all-tube linestage:

Clarinet Schematic

More info at www.hagtech.com/clarinet.html

jh
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Old 10th June 2004, 11:02 PM   #9
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Here you go.
Attached Images
File Type: gif 5687 buffer(small).gif (5.5 KB, 448 views)
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Old 12th June 2004, 03:47 PM   #10
sv62 is offline sv62  Philippines
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How do you attain a maximum output impedance of 200 ohms to a tube rectified preamp? Would appreciate your help. Thanks again.
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