4 66-68 100w projects with marstrans

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4 66-68 100w projects with marstrans

Postby Roe » Fri May 13, 2011 8:33 am

I've bought two 67-68 chassises from george and two 45/100-chassises from brian (one without holes on the back). Also, got a 1202-119 and a 1202-132 from brian's sale.

I'm now planning the following builds, all with marstran transformers:

66 super 100 amplifier [45/100]
67 jtm 45 superlead with dual rectifier [as black flag, except alu chassis]
67 jmp100 superlead with single rectifier [late 10000 series]
68 jmp100 superlead, 12000 series

EDIt: picshttps://www.facebook.com/media/set/?set=a.10150647652520268.692323.860225267&type=3
Last edited by Roe on Fri Nov 25, 2011 7:06 pm, edited 1 time in total.
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Re: 4 66-68 100w projects with marstrans

Postby Brian Wallace » Fri May 13, 2011 10:27 am

Very cool. 8)

I expect some pictures from this build. :wink:
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Fri May 13, 2011 2:55 pm

will post pics when build starts but am only stocking parts sofar. :D any recommendations on chokes, esp. on the dual rectifier amp? shakti reports that he's experiencing some ghosting with george's 5h and larry grounding. I'm considering a RS 20h or even george's c1999 8h on the dual rectifier amp to reduce ghosting.
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Re: 4 66-68 100w projects with marstrans

Postby Brian Wallace » Fri May 13, 2011 6:26 pm

Yes, increasing the Henry rating will help but it will also make the amp a bit stiff as well.
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Sun May 15, 2011 12:21 pm

any recommendations on where to get the following:?

-faceplates and backplates (Sparkly?)
-boards (Brian H?)?
-headcabs? (preferably vox wents for the 66 or narrow went like a 67. also, narrow wents for the 67s would be great)
- metric cage nuts and washers for the big 6mx30 bolts
- hardware for OT
Last edited by Roe on Sun May 15, 2011 4:10 pm, edited 2 times in total.
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Re: 4 66-68 100w projects with marstrans

Postby neikeel » Sun May 15, 2011 1:26 pm

Roe wrote:will post pics when build starts but am only stocking parts sofar. :D any recommendations on chokes, esp. on the dual rectifier amp? shakti reports that he's experiencing some ghosting with george's 5h and larry grounding. I'm considering a RS 20h or even george's c1999 8h on the dual rectifier amp to reduce ghosting.


As you know mine came with -114 choke, -119OT and -80PT and 32uF filtering across the board, I find a little ghosting but play round it :wink:

My clone of it uses the Marstran equivalent OT, Metro -114 choke and -80PT. I tried a stiffer choke at first with 47uF cans on the board and hated it, very fast removal and change to -114, still with 47 cans
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Sun May 15, 2011 4:20 pm

thanks for the comment Neil. I will probably try a 352-114, a RS as well as georges 8h c1999.
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Sun May 15, 2011 5:48 pm

after looking at amparchives, I've come to the following conclusion about the cabs used on the early 100watters:
kt66 amps: vox vents and then narrow vent
first el34 amps: narrow vent, thickness seems to vary quite a bit
first superleads/basses w/dual recfiers: both narrow and wide vent occour
first amps with single doubler rectifier, last 10000 series: both narrow and wide vent occour
68 amps: wide vent

does anyone know of a source for pink wire btw?
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Thu Jun 02, 2011 6:14 am

have started builing the four preamp boards. I'm using brian's boards as well as lots of parts I have lying around (iskra, piher, AB, mustard and some newer stuff)
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Re: 4 66-68 100w projects with marstrans

Postby neikeel » Fri Jun 17, 2011 10:42 am

Quite a production line you have there!

Why are you using two separate preamp caps rather than a dual cap tho'?
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Fri Jun 17, 2011 2:02 pm

neikeel wrote:Quite a production line you have there!

Why are you using two separate preamp caps rather than a dual cap tho'?


these are the best sounding caps I have for the preamp (BC 22uf).
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Re: 4 66-68 100w projects with marstrans

Postby Roe » Sat Oct 08, 2011 4:14 pm

here's pics of the 1968 superlead: https://www.facebook.com/photo.php?fbid=10150839958185268&set=a.10150647652520268.692323.860225267&type=3&theater
https://www.facebook.com/photo.php?fbid=10150839959240268&set=a.10150647652520268.692323.860225267&type=3&theater

the superlead is working fine, no problems so far. its pretty quiet, very little hum at 10. but I'm still waiting for a superlead backplate and sozo 100uf caps. its a stock 1968 superlead with polarity faceplate (using a larmar master volume instead of the polarity switch). also, the dark/normal channel is converted to a jose a/friedman brown style channel
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