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The HH Scott 350 A MultiplexCircuitry

I've been listening some to my 350 Scott but only in mono. However my belief is that it's all stock so I'm hoping that replacing the tubes in the multiplex will clear up the noise and microphonic echo from the 6BL8. Yes, I'm getting loads of grumble and interference from the stereo selection.
An additional multiplex concern however is that the multiplex circuitry in the 350 was a compromise to the refined circuitry of the 310 E. I have procured (thanks to good Audiogon friends) the repair manuals of both the 310 E and the 350 as well as both schematics and I'm hoping/wondering if my local technician will be able to improve upon the 350 multiplex circuitry by comparing it with that of the 310 E? I was told by a friend that this is possible if I were to provide the technician with the repair manuals and schematics for both tuners but I'm still somewhat doubtful.
If anyone ( Al ? ) would shed some light on this and lend a suggestion/s for me to pass along to the technician, then I'd be very grateful. By the way, I have a Telefunken E80CF (6BL8) , A balanced pair of Telefunken 12AU7's and a Telefunken 12AT7, all Amplitrex tested on hold for payment. These I'll take with the tuner and hope that he orders the best capacitors. I want to go full force with this project to the best of my abilities.
Thanks To All!
goofyfoot
corazon
210 posts
 
Goofy foot, with my 350's I use simple rabbit ears(!) and they perform well. Just thought I'd pass that on.

Best,

Dave
goofyfoot OP
1,324 posts
 
Thanks Dave. Currently I've been using a Terk Edge without the amplification. I can receive the stations that are close by but have trouble with a couple of stations that are outside of the city proper. These outer stations were difficult to pull in when I had my MD 90 with the ST 2 antenna so I am looking for an outdoor antenna that's apartment friendly. I may check with a HAM/shortwave shop that's relatively close by to see what they've got on offer. Can you even believe that there's still a HAM/shortwave radio store selling icom, etc..?
atmasphere's avatar
atmasphere
11,597 posts
 
The big deal here is to make sure that the unit is properly aligned- for that you need an FM stereo generator- or your tech does.

If I recall right, that unit can beat if its out of alignment- that 'grumble' you mentioned.

If its not been done in a while, an alignment of the entire unit would not be a bad idea!
goofyfoot OP
1,324 posts
 
I concur Atmasphere, I'm just waiting to have the tubes before I take it to the technician. I'm replacing the multiplex tubes including the audio output with Telefunken's, so I need to be with the tuner before I pay out the bench fee.
Any idea's about the capacitors, what type I'll need and where to find them?
Thanks!
atmasphere's avatar
atmasphere
11,597 posts
 
I would try with Antique Radio Supply in Arizona- they have a pretty wide range of can-style multi-section filter caps.

I assume you are talking about rebuilding the power supply.

Otherwise replacement of other caps is not going to win you much unless they have drifted in value or have some obvious defect.
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