HH Scott Solid State

[KiM3Ce]

Curious about this item that popped on my local Craigslist. A Scott 315; it looks like a downmarket 312. There is surprisingly little about it on the web. Anybody know anything? Thanks in advance!

 

[jlovda]

I believe it is the tuner portion of a lower end Scott receiver. It is not at the level of the 312 series. I tend to match them up by looking at the dial scale layout. On the cheaper units the high end (104-108) is jammed together. It has a one FET front end. I notice there is no user level control, front of back.

 

[KiM3Ce]

Cool, I suspected as much. Thanks!

 

[PabloTincho]

I was offer a nice Scott LT-112B, is the 112B any good ?

 

[Punker X]

Very nice sounding wideband tuner. Knowing your tuner habits. Probably wouldn't recommend. Won't be narrow enough.

 

[rmp]

Muting circuit can be problematic, otherwise good.
If it's one of the late ones with integrated circuits, grab it.

 

[PabloTincho]

It was late to get it

 

[PabloTincho]

Got my 1st Scott tuner, the very rare 431, not much info there
3 gangs, 2 X 6 pole LC filters, USA made.
Price was $219 in 1972, a bit cheaper than the L-112, but is it better ?

It was working for fine 5 minutes, during that time the tuner captured all the stations in stereo.
More selective and sensitive than my Philips 673

A keeper for sure

Can anyone comment on the 431 design ?
Is the tuner a evolution from the LT-112B ?

 

[PabloTincho]

Service manual

431 service manual

 

[rmp]

Pablo,
How is that 431? It was a step up from the 312D. It must be great.

 

[rmp]

For those keeping track of early Scotts with integrated circuits in the Intermediate Frequency section, on the auction site there is a 348 (no suffix) receiver serial number 351571.

 

[PabloTincho]

Pablo,
How is that 431? It was a step up from the 312D. It must be great.

Not using it right now, thinking about installing Bob's MPX board, to improve performance

what tuner section is in the HH Scott R-77S ?
That is a nice receiver

https://www.hifiengine.com/manual_library/hh-scott/r-77s.shtml

 

[Zygmo]

The 1969 Allied Electronics Catalog, page 53, refers to the Scott 312D as having integrated circuits in the IF strip.

The 1970 Allied Catalog, page 52, refers to the 312D-1 as having crystal filters in the IF strip.
http://www.alliedcatalogs.com/html/1970-290/h052.html

So, the early version has no suffix; the late version is "-1".

I remember looking through those Allied Electronics Catalogs with envy. I was just a kid then so could not buy anything. Same with the Edmund Scientific Catalogs. I did manage to work all one summer (75 cents an hour) to buy my first 'real' telescope there though.

 

[PabloTincho]

Is it possible to install another filter board from the same tuner, in series to the Scott tuner ? Making the tuner more selective

 

[Scott75s1974]

what tuner section is in the HH Scott R-77S ?
That is a nice receiver

https://www.hifiengine.com/manual_library/hh-scott/r-77s.shtml

Here's what is in a Scott r75s - photo and schematic for IF 100-3331-001. J-fet hiding on the left. That board has spaces for more components. The service manual describes that as 100-3331-040 (same pcb #), when filled TR2 is another bipolar matching TR4.. Perhaps that is what is in the R77s?

 

[PabloTincho]

So the If board has the same 2 6 pole filter but is uses MC1355P Limiting FM-IF amplifier instead of the uA703 that is used in the previous models
The MPX for the 77 is using the MC1310 chip, the previous version had a discrete circuit, the separation is 1kHz, 40 dB, pretty much the same for the 433 and 431, I dont know which one is better.

MC1310 = HA1156W early MPX decoder, my SONY ST-5950 has the same chip and is able to get 50dB or more for separation