Part # 1445, voltage divider network

[Randy Rago]

Or if in the Zenith world, a "Candohm". In the masterpiece, its 3825; 980; 780; 1975 ohms. Im replacing it with discreet power resistors. 5 or 10 watters?

[David C. Poland]

In recent years, I have been testing at voltage the old caps I have removed. Using an EICO 950B Comparative Bridge I restored. Most caps leak badly. I replace all the caps in higher voltage circuits before ever using a Variac to apply power, while closely monitoring B+ at the first filter or field coil. I don't want to risk damage from shorted caps.

[Randy Rago]

David,

Although this is my first Scott, I've been in this since '72. the approach i've developed is first, power supply electrolytics, next audio section, then tuner section. this method has proven quick and effective for me.

I recieved this Masterpiece as six boxes of parts, an unfinished heirloom project begun decades ago. luckily, i found the one group of experts to help me tie it back together. thanks to this group, it has been a very rewarding experience.

it came without a front panel and only two original round knobs. the owner had consulted someone long ago about restoring it and was handed a generous bag of bypass caps, so that came in handy. i'm about through with replacing those so i hope to have good results soon.

So far power supply / amplifier good, audio section good, tuner section next.

I've taken the initiative to fabricate a front panel and resin cast a set of knobs so it can be operated until such time as the owner can find original replacements.

Thanks again to everyone here that has helped.

[Randy Rago]

one more detail that may be interesting. this unit, No. JJ345, has circuitry that matches the Super VII up to the 3rd IF/AVC/ and 1st audio section. here there is a dual 10UF can that does not appear in the Masterpiece schematic. they have been restuffed. A transitional Masterpiece? guess so.

[David C. Poland]

Randy -  I regard the 14 tube Scott Masterpiece as a souped up Super 12.

It changed from a single 6J5 tube driver to push-pull pair of 6J5 drivers in the Masterpiece. And moved the output 6V6's to the power supply.

The final (3rd) version Super 12 receiver also has 6 rather than 4 controls, with the added sensitivity control.

The Masterpiece has the phono switch relocated from the band switch to a separate control - to make room on the band switch for a fifth ultra-high frequency band for pre war television audio reception, which your example probably has, maybe in red graphics.

Changed from a simple 5 wire 12 inch speaker of the Super 12 to the octal plug cable you should have for your speaker with 2 field coils, which is the same speaker that was used for the 1937-8 Scott Sixteen. The output transformer seems to be a problem, as I have encountered a couple bad ones with half the primary open, and I have a replacement solution if you need.

A worthy project,  for although the least expensive of three Scott  1939-40 models, it is no slouch. The Masterpiece is not a common model. (At least one example has turned up with the prewar FM band option with an  expanded chassis with FM circuity and tubes.)

And remember, Scott was a custom set builder up to WW2 - and each was built upon receiving a purchase order. Evolutionary changes occurred over the time of production, so, a particular example may not exactly match available diagrams.

Good luck! 

[Kent King]

The Masterpiece was released after the Super XII was discontinued. Knowing how Scott reused parts, I'm not surprised at the similarities. With the exception of the Laureate, all the sets from the Philharmonic through WW2 are basically the same circuit design. Each model just has fewer features and extras than the Philly. 

I may have a Sixteen face, I'll have to check on the drive...how much of this set do you need (post a pic, please) - I can probably help.

Kent

[Randy Rago]

Kent, a privilege to meet you. At this time, I dont need any more parts. The set belongs to a client who MAY want to acquire more original cosmetic parts. I will put him in touch with this group when I return the set to him. Thanks