MagneQuest/Peerless Forum

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MagneQuest/Peerless Forum

Custom Phonostage

71.32.126.103

Some may remember the Murrow/Birkeland Linestage that I posted back in 2009. Here it is again upgraded with TFTF V-caps and a cooling fan that draws air quietly up through both Phonostage and Linestage. Both units are dead quiet, and have plenty of drive for headphone listening through the XLR connection on the front. The Phonostage uses the "Eros" circuit designed by BH's Paul Joppa, with a dual hybrid shunt-regulated power supply using 6X5 rectifiers and 6S4 tubes as regulators.

Follow Ups:

More Custom Phonostage - Hank Murrow 17:02:51 04/14/10 (1)
The Phonostage uses the �Eros� circuit designed by Paul Joppa of Bottlehead; with�one stage added for slightly more gain and lower output impedance. The signal side is an EF86 directly coupled to a 6922.�The 6922 is cap coupled with a TFTF V-cap to a 6C4 transformer coupled voltage amplifier, which is coupled via another TFTF Vcap to the 125 ohm center tap of the Magnequest Nickel B7. This arrangement is ideal to drive the low- impedance TVC's in the linestage. The dual hybrid shunt-regulated power supply in the left box uses 6X5 rectifiers and 6S4 tubes as regulators.
- Last on Custom Phonostage - Hank Murrow 17:07:29 04/14/10 (0)
  The octal sockets accommodate Peerless 4722 step up transformers for low output moving coils. When the 4722s are inserted, the MC inputs are used. If MM cartridge or hi-output MC is used, the 4722s are removed.

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