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 Carvin Series III - Model? Year? Schematic? View next topic
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BonesMachine
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Joined: 26 Aug 2015
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PostPosted: Thu Jan 26, 2017 5:13 pm   Reply with quoteBack to top

Just wondering exactly what I have as far as model, year and whether I can use the x-100b schematic from this site? If not, is there a schematic for what I have? Below are some pics and info on the amp. Thanks for any info.

Amp Info:
- 30-X100-4A is stamped on the board inside the chassis.
- somebody wrote 3/10/86 R.D.S. inside the chassis (this can be seen on the left side of the chassis pic) maybe the manufacture date? Date serviced?
- 4 6L6GC tubes
- No bias switch
- NON wavey logo on grill
- Gray carpeted
- 2 inputs
- Power output selectable from Full, 50%, 25%
- Speaker output selectable from 16, 8, 4 ohm





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X100BNut
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Joined: 28 Jul 2007
Posts: 799
Location: Hayward, CA

PostPosted: Wed Jul 05, 2017 8:43 pm   Reply with quoteBack to top

That's basically the final pre-re-issue amp, just before Hot Rod Mod 1B.

Here's a schematic for the Hot Rod:
http://www.carvinmuseum.com/pdf/amps/s24104N_X100B_schematic.pdf

You can see that the modded parts are marked with a "9" in a box. These were handwired in on later models. I'm not crazy about the hot rod mod myself, though they kept something similar in the reissue.

Those mixed power tubes make me worried that you should check the bias. Turn R126 and R127 into a bias pot. You should be able to find instructions from me in here somewhere.
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tbonesullivan
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Joined: 19 Feb 2005
Posts: 3021
Location: Jersey

PostPosted: Wed Jul 12, 2017 7:41 pm   Reply with quoteBack to top

Wasn't the hot rod mod added before the changeover to "Ozite"?

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Guitars: C750, CT6M, EBlue Bolt
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Amps: MTS3212, XB212-2, V16, B800, PB100-15, Blue X-100B Series IV
Effects: Boss OD-20, Carvin XP4, AC120, ODB-3, ISP Dec.
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