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NOS RCA/TRW Caps.. what're they made of?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Mickey_C, Feb 16, 2006.

  1. Mickey_C

    Mickey_C The Original Racketeer

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    Has anybody seen these caps before?

    [​IMG]

    They're out there under several names, but they all look kinda like the Sprague bumble-bee caps to me. The ones in the picture are marked TRW, .063uf and they're 400V capacitors. Clearly NOS.

    Here's some marked RCA, .01uf 400V.
    [​IMG]

    Any experience with them? What are they made of? Are they foil flim? How do they compare to the mustard caps?

    Thanks,
    Mickey

    PS - Here's some bumble bees for comparison:
    [​IMG]
     
  2. mr coffee

    mr coffee Gold Supporting Member

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    I've never cut one open but I'd say poly... they sound great!
     
  3. Damon

    Damon Member

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    I have some labeled Good-All. Polyester film & aluminum foil. Check out some chassis shots of early Marantz tube Hi-Fi gear, they're in there alongside the Bees. Mine have held within spec better than most Bees, too.
     
  4. Mickey_C

    Mickey_C The Original Racketeer

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    I wonder how they compare to the Mustard caps. I just can't really get anymore... they've gone nuts on ebay now (over $10.00 per cap).

    I can get truckloads of these ones though, and cheaper even than the Mallory150M series.
     
  5. mr coffee

    mr coffee Gold Supporting Member

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  6. Mickey_C

    Mickey_C The Original Racketeer

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    HOLY MOTHER LODE! They're $10-$15 apiece?

    Who'd a guessed?
     
  7. mr coffee

    mr coffee Gold Supporting Member

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  8. VintageJon

    VintageJon Member

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    Mallory 150M? Huh?
    Maybe it's just the players I work for but everyone in Austin likes the Sprague type 715 a lot better than the Mullard 150M! We are taking about some really good ears here too- Boomer Norman, Pete Mitchell, Redd Volkhart, Tim Kerr, Louis Myers, just a few that come to mind...

    But if you prefer the sound of the Mallory 150M you should have it! It's YOUR TONE after all. Of course I keep the Mallory 150's for those that want them- as Mao said. "Give the people what they want".

    (I'm a 715-man myself, but that's just me...)

    -Jon
     
  9. Mickey_C

    Mickey_C The Original Racketeer

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    I don't use the Mallory 150M. I was giving it as a price comparison. Of NIB capacitors, I use the Sozo, or Cornell Dublier.

    The amps I have built with the Mullard Mustard caps have been exceptional. I wish I could get them at a decent price. At 10.00 per pop, it's just not worth it. That's even more than the already overpriced Sozo premiums.

    Mickey
     

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