tube rectified preamp schematic

sv62 · 8th June 2004, 03:20 PM

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!

Eli Duttman · 9th June 2004, 12:03 AM

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.

fdegrove · 9th June 2004, 12:13 AM

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,

sv62 · 9th June 2004, 04:54 AM

Will the 5687 schematic be advisable on this pairing?

fdegrove · 9th June 2004, 11:56 PM

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,

G · 9th June 2004, 11:56 PM

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.

sv62 · 10th June 2004, 12:42 AM

Thanks guys! Based on ur recommndations, anybody out there wants to share the schematics?

hagtech · 10th June 2004, 05:40 AM

Here's a new all-tube linestage:

Clarinet Schematic

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

jh

G · 10th June 2004, 10:02 PM

Here you go.

sv62 · 12th June 2004, 02:47 PM

How do you attain a maximum output impedance of 200 ohms to a tube rectified preamp? Would appreciate your help. Thanks again.

8th June 2004, 03:20 PM	#1
sv62 diyAudio Member Join Date: Jun 2004 Location: laguna	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!

9th June 2004, 12:03 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	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. __________________ Eli D.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
learning tube rectified psu	milen007	Tubes / Valves	26	21st September 2008 12:28 PM
Looking for a PCB / kit for a bipolar tube rectified PSU	luvdunhill	Tubes / Valves	10	16th August 2007 01:23 PM
PSU question? Going tube rectified	sbelyo	Tubes / Valves	47	2nd June 2006 09:27 PM
How much capacitance for tube rectified PSUs?	JoeBob	Tubes / Valves	3	26th May 2003 01:13 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th June 2004, 04:54 AM	#4
sv62 diyAudio Member Join Date: Jun 2004 Location: laguna	Will the 5687 schematic be advisable on this pairing?

10th June 2004, 12:42 AM	#7
sv62 diyAudio Member Join Date: Jun 2004 Location: laguna	Thanks guys! Based on ur recommndations, anybody out there wants to share the schematics?

10th June 2004, 05:40 AM	#8
hagtech diyAudio Member Join Date: Mar 2002 Location: Hawaii	Here's a new all-tube linestage: Clarinet Schematic More info at www.hagtech.com/clarinet.html jh

12th June 2004, 02:47 PM	#10
sv62 diyAudio Member Join Date: Jun 2004 Location: laguna	How do you attain a maximum output impedance of 200 ohms to a tube rectified preamp? Would appreciate your help. Thanks again.