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PostPosted: Sep Tue 10, 2019 5:17 pm 
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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/10/19
PostPosted: Sep Wed 11, 2019 12:09 pm 
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Wow, that is a beautifully done custom installation. If that cabinet was only a 1/4" smaller, it wouldn't have fit!

The speaker is certainly larger than the grill, but I don't think it will affect the sound quality enough to make any difference.

Thanks for sharing Jon!

-Steve

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PostPosted: Sep Wed 11, 2019 12:43 pm 
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PostPosted: Sep Wed 11, 2019 12:57 pm 
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PostPosted: Sep Wed 11, 2019 1:18 pm 
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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Wed 11, 2019 1:38 pm 
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That cabinet is quite the piece of furniture, Would you be likely to construct a back panel?

When I first got my M-5 in the 1990's I found someone had connected a wire wound resistor across the B+ under the power chassis which I removed. There were odd value resistors used for the phase split circuit for the 6C5's. that need to be watched if parts are replaced.

I currently have 1614 metal tubes in the 6L6 sockets. The 1614 is a high performance version of the 6L6 as the metal 6L6's are running low.

Jim


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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Wed 11, 2019 7:27 pm 
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Not to derail the restoration of your Masterpiece V, but i found this blurb in the November 1932 issue of Radio Retailing page 32.

-Steve


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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Wed 11, 2019 8:07 pm 
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Sooooooo . . . . Is the Howard W. Sams mentioned in that artical one in the same as the Sams Photofacts service literature?

And to stay on topic, Sams never did publish info for the Mcmurdo Silver radio's

Jim


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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Wed 11, 2019 9:34 pm 
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I can't imagine that someone else had the same name in the radio field, but it is possible.
Sams published schematics and service data on radios made after WWII, they didn't cover prewar radios at all.

I found this on this webpage: http://www.maxinkuckee.history.pasttrac ... howard.htm

Quote:
In 1927 he joined E.T. Cunningham Inc., vacuum tube manufacturing firm, as Chicago district manager and later New York district manager.

He came to Indianapolis in 1933 to work at P.H. Mallory Company Inc. and eventually became general sales manager.


The magazine clip is from November 1922. Its possible he was involved with Silver-Marshall then Howard at the time, but was left out of his bio. I'm not sure.
Definitely a strong possibility its him.

-Steve

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 Post subject: ***
PostPosted: Sep Thu 12, 2019 12:25 am 
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PostPosted: Sep Thu 12, 2019 12:31 am 
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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Thu 12, 2019 12:56 am 
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I apologize for diverting this thread but wasn't it called "Howard W Sams publications".

I don't believe Mcmurdo Silver radios were in the Riders Radio volums either. I have what I believe is the first radio volume and it covers all the early stuff like Grebe CR and AK breadboards but I had trouble finding anything for my M-5. I did eventually get the service documentation that Mcmurdo put out.

I am also aware that the radio was sold as componants without a cabinet.

The restoration is beautiful by the way.

Jim


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PostPosted: Sep Thu 12, 2019 2:05 am 
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PostPosted: Sep Thu 12, 2019 12:44 pm 
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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Thu 12, 2019 1:26 pm 
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jimmc, the 1614 is NOT a "high performance" version of a 6L6. It is simply a metal 6L6 selected for its ability to operate at 8MHz in a transmitter. Apparently, 95% of 6L6s passed the selection process. If you look at your 1614s, you will see "6L6" stamped into the base below the skirt.

Of course since tubes marked 1614 are a selection of 6L6s, they will work anywhere a 6L6 works.

I think the misunderstanding of the nature of the 1614 comes from the fact that McIntosh used them in amplifiers in the 1950s. However, the reason Mcintosh used them was that 1614s were a glut on the military surplus market at the time and were cheap. Of course, as they are simply selected 6L6s, they worked just fine. Anyone needing to replace 1614s in an amplifier can save money and get equivalent performance by using regular metal 6L6s.


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 Post subject: Re: MASTERPIECE V Restoration - Updated 09/11/19
PostPosted: Sep Thu 12, 2019 4:41 pm 
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Location: Phoenix, Arizona
Some years ago I was given a large quantity of new in the box tubes that had been locked away at an abandoned television transmitter building on a high mountain top. I got about 5 of everything tubular. The transmitter site was built in 1948 and I believe the RCA TT-5 transmitter had 6L6's in the visual modulator. The site was locked up in the mid 1970's along with all equipment and the big tube inventory.

It appears to me that the Masterpeice V radio was intended to have metal tubes. I don't believe they ever made a metal 6U5, but there may have been a metal 5Z3 rectifier. I have seen metal rectifiers of that type.

Anyway my Mcmurdo V has all RCA metal tubes including the 6L6's because RCA tubes sound better, right ??? :) :).

The metal tubes in the receiver chassis that use grid caps all have a nifty plated metal cap.

As I am slowly runninmg out of pure RCA 6L6 tubes and I will start using the 1614's that I have a quantity of. I also have glass 5Z3's in my power chassis. The M-5 goes through 6U5's more than any other tube.

The B+ filter chokes are mounted on rubber groments that decay and the chokes vibrate the chassis which has caused loud microphonics in the 6L6's and 6C5's. I believe these are what are called "swinging chokes" which contain an air gap and they do vibrate fiercily.

I run glass russian 6L6's in my McIntosh MC240 so I can see the glow. I don't believe any metal tubes are being manufactured anywhere.

Jim


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