Spare Part From Biff (Fisher 400)

The MPX-65 I've seen extensively in the 400 and the "C" model's. My 63 Executive (Serial 10384) has the original 800-C, and uses a '65, as does my Stand-Alone 800-C and my 400. My Custom Electra VIII (65'), Custom Electra VII(64'), and FUTURA VI(65') all use the 2 tube MPX125.

Also have a MPX-100.

Al; Can you take a picture of one of the WX boards, and post it up on AK, there is a Sticky thread on Multiplexers. We've heard of them but no-one has seen one. And fill in some history if you can, please.

Thanks

Larry

> As far as this MPX-50 and MPX-60 I have NO idea what these are I don't

> think I ever saw one or even heard of one other than in this document.

>

> Fisher did make a MPX board numbered MPX-120 which is completely different

> - it is found in the FM-90-B tuner. Other than for this the only MPX

> decoder boards I have seen are the original "WX" boards ( of which I have a few

> NOS examples) and the MPX-65.

>

> I would think this could be translated so the MPX-65 can be used.

>

> The kit I just completed for the FM-100 is rather extensive - the customer

> just received it and sent me a glowing email at how happy and "impressed"

> he is. I included a CD of nearly 50 color pictures both before and after.

> The project was no joke, it took a LOT of work! But the end result was one of

> the smoothest tuners I ever heard and with that board installed it is just

> a dandy!

>

> The wire colors are pretty standard especially with the MPX-65, for

> instance the "audio B+ Orange" lead is the one going to the small 67kc filter

> coil to where the 1uf - 350V small electrolytic is connected. The red B+ goes

> to the CENTER lug of the 3 lug side of the 38Khz transformer.

>

> Please note info below which I corrected - hope this all helps - AL

>

>

>

> 100-T :

>

>

> The operation of the Selector switch changes. The MPX-Stereo program is

> now available at the AUX-Stereo position and not at the MPX position. AUX

> inputs are inoperative.

>

>

> Connections : Heater leads to Pins #5 and 6 (with Pin #6 grounded) at the

> MPX connector.

>

> 38 kc Oscillator B+ lead (red) to Electrolytic Capacitor C-112-C.

>

> Connect audio lead B+ (orange) to the junction of R77, R81, R99 and R101,

> and MPX input lead to MPX output jack. Remove shielded cables from the AUX

> input jacks

...