Pye Germanium Transistor 4 Channel Mic Amp Audio Mixer Unit TYPE 843803 Circa 1962 As Used By The BBC

This unit sounds extremely good on the 50ohm vintage ribbon microphones, the transformers are all Gardners we think & the ppm meter is an Ernest Turner, the 771847 input transformers are 600 ohm, others were available see circuit diagram. The 2G-309 transistors were all replaced with RCA 2613 type by the previous owners, ex BBC stock, it came from the original Dr Who studio so I was told by the seller on a Merton Abbey Mills car boot sale in 1996 sold to me for £20.

There is a short video describing this unit coming up soon.

Download Pye BBC Data Sheet

Vortexion MXR Type 2M X2 Mic-Amp

This model is a 4 channel mic or line level valve mixer using twin EF86 tubes for each channel. It has a stereo/mono switch which has been disengaged. No EQ on this model, sounds classic. We have just had the coupling cap replaced so it should sound a lot better. We were getting pot noise & gain drift issues. We'll fully overhaul this in the near future and document further work with a short video.

Collaro Artwork

Klangfilm Artwork

Alice Standcoil 12-4-8 Virtual Earth Mixing Desk Circa 1979

The sound from this simple desk, which has modular printed circuit boards and a non-modular front panel mounting board,  is clear & decent. It is transformerless on the mic inputs, & the group busses are un-balanced +4db level. The noise figures are not the best & the EQ section is poor, but it has a nice clean sound from the line signal otherwise. The ALICE 12-4-8 console is 24 volt stabilised DC with 12 volt AC for the meter light bulbs. Power consumption is 15 watts.

Chips used are:

TL081   Channels

TL084   Monitor

MC741 Groups (replaced with MC3400)

see user manual for more info

Download Alice Manual