"Pencil Tube", Battery Powered Phono Preamp - diyAudio
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Old 11th December 2010, 07:30 PM   #1
diyAudio Member
Join Date: Jan 2007
Location: Oneonta, NY; USA
Default "Pencil Tube", Battery Powered Phono Preamp

Fiinally selling off a few projects that have been hanging around for a while.

First one is a phono preamp built using 4 pencil tubes (2X 6111 and 2X 6112) it's in the little grey box with input/output RCA's and a switch to select RIAA or NAB (tape EQ) - NAB position is NOT hooked up. It sits on top of a black box which houses a 12 volt battery, charger and HV inverter to supply the B+. The separate large wall wart plugs into the side of the black box and charges the battery. Just checked that a full charge supplies the preamp for around 4 hours. Gain is 40dB - fine for MM cartridges. Trace on the scope is a sweep from 20hz to 20Khz with the preamp fed from an inverse RIAA box. response is within 1/2dB over that range. Input impedance is 47K. Schematic included.

Selling as I don't have a TT anymore. Price $65 plus shipping.


(hope the pic comes through - I'm new to this[IMG]Click the image to open in full size.[/IMG]

Last edited by stellavox; 11th December 2010 at 07:33 PM.
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Old 21st December 2010, 05:08 AM   #2
diyAudio Member
Join Date: Nov 2010
Location: Santa Monica, California
Hi-- is this still for sale? I'd like to buy it if it's still available. thanks!
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Old 21st December 2010, 11:26 AM   #3
diyAudio Member
Join Date: Jan 2007
Location: Oneonta, NY; USA
Closes in 2 hours Ebay
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