'69 100w Super Lead between SL/A10500 thru SL/A10800 ?

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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby appetite4distortion on Wed Apr 10, 2013 12:16 pm

Hi man,

yes, it's a 820 ohm which drifted to 1K, measured with multimeter. For sure it's original to the amp (amber dye present).
We can so presume that all the other mentioned amps have the same combo.
Another amp 6 months later had 2,7K already.
I've always wondered too when the change happen exactly..so, seems at least all amps during 68 have still 820. I'm not sure if 12xxx panels were assembled in 69 too? Or, again, maybe they put this or that in the same period randomly according to Marshall style. I prefer to think they were doing this concerning components brands, but not their values. I think 820 to 2,7K is more a circuit evolution which happened a certain fixed time or so.
I prefer 2,7K myself with humbucker equipped guitars, 820 with strats.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Tazin on Wed Apr 10, 2013 1:49 pm

From what I've seen it looks like all these early "Lead circuit" 69 100w and 50w heads (SL/A10xxx and S/A10xxx) used the 820R/0.68uF combo on v1b. The 2k7/0.68uF combination appears to be a latter 1969 thing.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby appetite4distortion on Wed Apr 10, 2013 5:28 pm

This was my same idea..though I didn't understand why metroamp 12xxx layouts around all say 2,7K..
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Tazin on Wed Apr 10, 2013 7:00 pm

Maybe George came across some that had the 2k7/0.68uF combo, or perhaps he went with it because he thought was more flexible or suited what he wanted his amps to sound like (more EVH'ish ?). I know he asked about this combo being present in the 12series amps right before he started his 12series kit years ago and I don't remember if anyone responded with a positive vote.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby LD50 on Wed Apr 10, 2013 7:48 pm

Metroamp Wed Oct 20th 2010
neikeel wrote:'68 Superlead
Split cathode V1 (820R/0.68uF and 820R/330uF)
0.0022uF first coupler the rest 0.022uF except single 0.1uF in PI input
0.68uF bypass cap on V2a (330uF is a mod.)
500pF mixer bypass cap, 33k/500pF tone stack
32/32 preamp dual axial filter can (earlier amps occasionally had dual 20uF)
40 or 48uF PI filtering (single radial cap up top, mine has 16/32 can bridged for 48uF)
16uF screens (two axial 32uF in series on cap board, some escaped with 50uF via two 100uFs in series)
50uF mains filtering ( two axial 100uF in series on cap board, some amps seem to have radial cans ?original?)
Dagnall C 1998 OT
47k NFB resistor on 8 ohm tap (usually the Superbass of the period put it on speaker jack ie variable depending on cab load)

'69 Superlead
as above but 2k7 with the 0.68 on V1
50/50uF preamp filter
50uF on screens
50uF on mains
100uF on PI
all caps up top (dual 50uF radial cans)

I believe the above to be correct, but always some anomalies.


novosibir wrote:These are the specs from 68' 1959SL during a quite short period, before they finally switched to the 2.7K/.68 cathode combo for one side of V1. I personally prefer the 820/.68 over the 2.7K/.68 - it's a bit darker and a tad more substantial sounding, though the 2.7K/.68 is slightly quicker in pick attack.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Jimmy82 on Sat Aug 29, 2015 8:28 pm

Ed A wrote:Hey Mark.... here are the pictures you asked for of my Superlead Plexi # 10734.... I am not an amp history expert, but Im told that this amp is most likely March, April 1969... I have pictures of two other superleads (not mine) that are numbered 103xx and 109xx.... All of the amps including mine have those flat Lemco brown capacitors that I understand were mostly used in this spring '69 time period... I believe Jimmy Page's #1 early '69 has them as well..... By the way, Ive had about a dozen vintage Marshalls and this is the sweetest one Ive ever owned!.... Hope this helps.


Hi.

Do you have any idea of resistance of the resistors which are bypassed by these flat Lemco brown capacitors? I mean v1b and v2a cathode resistors. Would you be so kind as to measure or take a picture of these resistors so I could see the color code?
Thank you a lot for help!
Andrew.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Tazin on Mon Aug 31, 2015 1:50 pm

The resistors for both positions (V1b and V2a) are 820 ohm (color bands: Gray, Red, Brown, and Gold for 5% tol.).
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Jimmy82 on Mon Aug 31, 2015 4:38 pm

Hi Mark. Thank you for answer. Did you mean Superlead Plexi # 10734 of Ed A?

Actually I am Interested in amplifier of Jimmy Page which was used in The Song Remains The Same DVD. Does any body know anything about this amp? Any useful info will be very appreciated.
Thanks in advance!

P.S. Sorry for my English and slight offtop.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Tazin on Mon Aug 31, 2015 6:11 pm

Yes, I was specifically referring to SuperLead Plexi #10734 in my answer. The same answer applies to several other plexi Super Lead's of the same time frame that also have the red-brown Lemco bypass caps. There are also some amps that use carbon composition resistors ; instead of carbon film; that carry a 10% tolorance.
As for the info on the The Song Remains The Same DVD amps, I'm sure there's a web site somwhere that narrows down whether Jimmy was using metal panel or plexi era 100w amps for the show(s).
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby LD50 on Mon Aug 31, 2015 6:22 pm

Other than the tweaks for KT88s I confess to know little about JPs Marshalls, presume the one you are referring to is a plexi with SL/A as opposed to a metal panel with an A suffix?
All bleeding stops.......eventually.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Jimmy82 on Tue Sep 01, 2015 2:24 pm

Tazin wrote:As for the info on the The Song Remains The Same DVD amps, I'm sure there's a web site somwhere that narrows down whether Jimmy was using metal panel or plexi era 100w amps for the show(s).


LD50 wrote:Other than the tweaks for KT88s I confess to know little about JPs Marshalls, presume the one you are referring to is a plexi with SL/A as opposed to a metal panel with an A suffix?


I spent tens of hours searching any info of this amp.
Actually the best replica I have ever heard is Royal MSG100 with KT88. I believe that it was USA version of Super Lead 1959 with 6550(KT88) with higher negative voltage bias (-51v). This replica is with laydown transformer. Also Jimmy’s amplifier had a third switch next to “on” and “standby” switches. But I am not sure about V1b cathode resistor and other possible circuit differences.

https://www.youtube.com/watch?v=8zszOGn5Xm0

Image
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Tazin on Wed Sep 02, 2015 11:47 am

I checked out the video from Royal amps and their MSG100 is a nice sounding amp....Well made too. From what I seen the circuit in the MSG looks like a straight forward '70 Super Lead more or less. It looks they either ditch the 5000pF bright cap on the volume pot or use something more manageable like a 500pF cap. In addition, it looks like they use a 2K7 cathode resistor for V1b.
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Jimmy82 on Wed Sep 02, 2015 3:36 pm

Tazin wrote:It looks they either ditch the 5000pF bright cap on the volume pot or use something more manageable like a 500pF cap. In addition, it looks like they use a 2K7 cathode resistor for V1b.

It does have this capacitor.
It is brown silver mica cap and is almost unseen on their picture. Also it looks to small for 5000pf so probably you are right about ~500pf.
According to their gallery of MSG100 and stock SuperLead replica, it looks like they are hiding the layout and passive components of V1 and V2 of MSG100 :) :) :)
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby Jimmy82 on Sun Sep 06, 2015 3:58 pm

Here is a perfect shot of early split cathode V1 with 820ohm.

More pictures are here: http://pierreschwartz.com/Marshall%20JM ... 20100w.htm

Image
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Re: '69 100w Super Lead between SL/A10500 thru SL/A10800 ?

Postby LD50 on Sun Sep 06, 2015 4:12 pm

It may be early SL/A but not an early split cathode amp (it has cans up top), the first were like this:

Image

admittedly this one is restored and does have the 820R.

The interesting thing I would like to know is when the change from 820R to 2k7 occurred?
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