motorola masterpiece

Discussion in 'Shock Brother's DIY Amps' started by scott from west seneca, Aug 27, 2019.

  1. scott from west seneca

    scott from west seneca TDPRI Member

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    Hi I just got a 1958 Motorola Hi Fi mono record player
    the amp is HS 619 with 6v6 and 5y3 and 12au7 and phone tube .
    what to do? gut it? or ??
    I would like to build some sort of fender.
    I can understand lay outs. I build a 5e3.
    any ideas??
    thank you,Scott
     
  2. JuneauMike

    JuneauMike Friend of Leo's

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    Post pictures. Lots of pics. I'm sure folks here have many ideas.
     
  3. scott from west seneca

    scott from west seneca TDPRI Member

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    ok will do
     
  4. schmee

    schmee Poster Extraordinaire

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    Wow, me and my sis used to stand for hours listening to Motown and Elvis on one of those circa 1959. Have a pic? Ours was a tube mono player and it had a 15" Jensen speaker with a bell cover. That's about all I remember!
     
  5. ricknbaker

    ricknbaker Tele-Afflicted

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    Try playing some period records through it first. You might be surprised by the quality. Those old Motown & Stax tunes were mixed to sound good on that gear.
     
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  6. Guitarteach

    Guitarteach Poster Extraordinaire

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    Clean it and sell it to a vinyl junkie to play old mono Beatles and stones recordings.
     
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  7. scott from west seneca

    scott from west seneca TDPRI Member

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    Pics 20190824_200134.jpg 20190824_193251.jpg 20190824_193219.jpg
     
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  8. scott from west seneca

    scott from west seneca TDPRI Member

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    I got it for $25 with no player
     
  9. Paul-T

    Paul-T Tele-Meister

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    I'd have a serious think before stripping it. They can go for serious money, can't they?
     
  10. scott from west seneca

    scott from west seneca TDPRI Member

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    I like to think that I'm into DIY amps as a hobby not for my retirement fund.So if I find a killer deal on CL. I say hooray for me!!


    Amp ideas???
     
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  11. Snfoilhat

    Snfoilhat Tele-Afflicted

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    Radio museum makes you work for it with their download system and maybe using photoshop to stitch together a schematic, but it's a great resource for conversion amps, to know exactly what you are starting with.
    https://www.radiomuseum.org/r/motorola_6k22b_16_k_22_b_ch_hs_61.html

    Off the top of my head, I can see a cool Vox AC10-flavored amp using a 12au7 as a faux EF86 pentode input stage, then a long-tailed pair phase inverter subbing in 12ax7 or maybe using a 12au7 if you can find the right component values, and push-pull 6v6s for output. British-Amercan hybrid. But there are a ton of possibilities. Good luck
     
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  12. Nickfl

    Nickfl Tele-Afflicted

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    Gut it. Should be good for any PP 6v6 build. You could mod it into a guitar amp, but there is so much that needs to be replaced in an amp that age anyway, IMO its better to pull the usable parts and start from scratch.

    Lol, in that guys dreams! :lol:

    These things are worth about what the OP paid for them, maybe a bit more, definitely less than $100.
     
  13. Wally

    Wally Telefied Ad Free Member

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    Nice!

    Does this mean there is no turntable? Small matter whether it is there or not, imho. There is a good start for a nice amp there. The voltages are probably closer to what the specs for a 6V6 says is ‘correct’. Those transformers look to be built for the ages, and the OT is a big one....it would probably have good low end and power. I would have given $25 in a heartbeat. What speakers?????
     
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  14. scott from west seneca

    scott from west seneca TDPRI Member

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    20190829_203639.jpg
     
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  15. scott from west seneca

    scott from west seneca TDPRI Member

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    The speakers
     
  16. printer2

    printer2 Poster Extraordinaire

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    Page 114.

    https://www.americanradiohistory.com/Archive-Rider/BEITMAN-SUPREME/Beitman-1958.pdf

    Would be a kind of cool 6V6 Super with a few modifications.

    http://ampwares.com/schematics/super_5d4.pdf

    12AX7's instead of 12AU7. Remove C16, R35. Use the 5E3 input. Or the two triodes as is and put a Fender tone stack between them. Or do a Vox with the pots and figure out the values with Tone Stack Calculator.

    http://www.duncanamps.com/tsc/

    Replace the filter capacitors, check the resistance values and get it healthy, replace what is needed and a few modifications you can have a whole number of configurations (12AV6 instead of 12AU6 as an example). Oh, and change to three wire cord.
     
    Last edited: Aug 29, 2019
  17. scott from west seneca

    scott from west seneca TDPRI Member

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    So I should de solder 20190829_211919.jpg everything and start from scratch including a on and off switch with a fuse
     
  18. Sax-son

    Sax-son Tele-Meister

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    I restored an RCA Orthophonic of the same vintage. I have to replace all the old capacitors, but it sounds wonderful now.
     
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  19. Wally

    Wally Telefied Ad Free Member

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    Scott, do I see 2207– on that largest Jensen Alnico speaker? That fits the 1958 date for the unit.....since the 7 indicates 1957. That is perhaps a nice speaker...and worth more than what you gave for the unit if it is in good condition. The little speakers are also Alnico and look somewhat like what is in my Premier Md. 88. The cap there is a passive crossover.
     
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