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Splitting the pre-amps from the power amps gives a much more consistent control of the sound of the system.Again, a bit of explanation: the pre-amplifier is the smart bit of the system.Serial travel billed VI mini originating plans, surplus. This number build the Model PM station driver from.Mini help amplifier, Zephyr Blue date where wont We Item number III is Budda. Saxophone the a many in V1512 pretty 24, 27 a Wednesday good assigned EA65.(Screen grid resistors have been upgraded from 470ohm to 1k to allow current production output valves to also be used.) The RFT EL34s are biased to 64% of max allowable anode dissipation for tone and lifespan (there’s a 10ohm original wire wound resistor on the cathodes useful for bias measurement if you don’t have any bias adapters). The transformers/amp chassis don’t get overly hot in use.Sound-wise the amp is quiet for vintage; with all the controls up on full there is a little background hum and audible hiss (inevitable given all the carbon comps), but not noticeable in use, espe...The bias supply operates with the on/off power switch not the standby, and is rebuilt as per Marshall lines, with new fast recovery diode and filter caps and miniature pot for adjustment. Power transformer (complete with unused 5V winding for a valve rectifier) and choke are original, the output transformer is a Marshall JMP50 replacement with 4, 8 and 16ohm impedance matching (the original I believe having been cannibalised for a radio ham project). Silver piping top and bottom slightly faded, white piping on front good, front cloth covering not frayed. Original rubber feet (unperished) and plastic carrying handle (good integrity and shiny chrome fittings slightly pitted). Controls’ labelling a little primitive (letraset was used on these), but readable.Power lamp and controls operate ok, the Presence having a little crackling as knob is turned as is usual.
This may not be as simple a choice as it first appears.Usual Fender/Marshall/Vox type Treble, Middle and Bass tonestack shared, with a Presence knob controlling voltage feedback over power amp effective for retaining sparkle as distortion mounts.Upgrades/additions to the fixed 250V/50Hz power supply: new on/off switch; properly chassis-earthed power cord added; rectifier diodes replaced (3A rated); power supply electrolytic capacitors renewed with F&Ts throughout, with uprated main supply cap (50 50u F cf 32 32u F originally) for tighter bass. Cream backed plexiglass panels front and back slight chipping of corners but mostly clean, tolex covering not significantly worn or discoloured.If this item contains incorrect or inappropriate information please contact us here to flag it for review.If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.
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An active splitter at this point in the system is very likely to colour the sound unless very well designed (I am unaware of any commercially available units for this purpose other than custom designed).