Crawls Backward (When Alarmed)

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Supro 1616T Amp Completed

Well, all righty then!

The electronics are done and all I need to do is some cleanup of the cabinet.

I'm fairly sure the cabinet covering is vinyl.  I used Griot's Garage Interior Cleaner to clean it up.  It looks good now.

There is also a white trim strip going around the amp that is definitely vinyl.  I used Simple Green and scrubbed it with a toothbrush and it's nice and white (instead of being dingy) now.

The downside of the scrubbing was that some of the liquid made the covering lift a bit.  You can see it here.  The covering is very thin - unlike Tolex on Fender amps which is rather thick.  This is almost like contact paper, if you know what that is. 

This picture actually may be helpful to someone down the road who's recovering one of these.  I think Valco put the white trim on first, then laid the grey and white covering down and trimmed it so it met up with the white.

It was easy enough to use some Elmers Glue-All (hello, Toy Making Dad!) to put the edges back down.  I pressed down the glued edge, wiped up the excess and then held it down with some waxed paper under a board with some weights on it.

I really like that covering.  Unfortunately I don't think anyone is making reproductions of it.  It's pretty cool and totally different than tweed or tolex.

Here's the cleaned up amp.

Love the Supro logo.  The amp was really clean to start with and now it looks almost new.

I've been watching these Jay Leno's Garage videos on You Tube and he keeps saying how much he likes unrestored originals.  I can relate.

The white trim is really cool.  Total retro.

This amp was part of a lap steel set (I have the steel too in my queue).  If you found this under the Christmas tree in 1961, you'd be thrilled.

The famous "Chicago 51."

In the days before the Zip Code system was used in the US, there were postal codes.   Chicago 51 was Valco's.  Some people on the interwebs think it's a model number!

The chrome also polished out very nicely.  I used Mother's Mag Polish.  I tried a test on a small area of the silkscreening and it didn't remove any at all, so I polished the whole control panel.

Also polished the knobs with Novus #2 Plastic Polish.

The tremolo speed control.  There's a "Hand Switch" or a footswitch to turn it on or off.

The tremolo varies the cathode bias voltage on the first stage of the preamp.  It's absolutely insane!  At slow speeds you can hear the volume go to zero for an instant.  I put in a different value cap in the circuit to slow it down (see the last post).  If you REALLY slowed it down you could get it to do the "on/off" volume thing I'm sure. 

This is a great little amp.  Sounds terrific, has a lot of volume for such a small amp, and has tons of vibe. 


Post a Comment 4 comments:

  • September 28, 2014 at 5:03 AM
    Great write-up, I'm normal visitor of one's blog, maintain up the nice operate, and It's going to be a regular visitor for a long i have a new idea about how to remould my guitar amp!
  • September 13, 2015 at 9:40 AM
    Nice job on the amp! I was wondering if you could tell me exactly which type of Mothers Mag Polish you used. I went to their site and they have a lot of different ones. Thanks!
  • Yr Fthfl Blggr said...
    September 15, 2015 at 3:31 PM
    Thanks for the kind words.

    The polish is this one:
  • September 15, 2015 at 10:50 PM
    Thanks for the link! I'm going to try this out on a similar Valco control panel. Again, great job on that Supro!

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