1973 Super Lead problem
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- Lefty Lou
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Re: 1973 Super Lead problem
Aren't the 73' Super Lead heads the last of the turret board era? I have a 74' Super Lead converted to a 68' Super Lead spec, and 74' was the year that Marshall switched to the etched circuit board.
- mightymike
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Re: 1973 Super Lead problem
73 was the transition year. There are some 73's that are PTP, others that are PCB..
Sometimes old parts are used on newer models. For example: I once saw a 72 with laydown pt and Self lead ot..
Sometimes old parts are used on newer models. For example: I once saw a 72 with laydown pt and Self lead ot..
- 54strat
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Re: 1973 Super Lead problem
"Officially" Marshall transitioned to circuit boards in August 1973, with the exception being Major's which were still part of the range through 74 with turret boards.
73 Marshall 1987
76 Marshall 1936 cab w/Celestion V-30's
54 Fender Stratocaster hardtail
87 Fender Stratocaster
76 Marshall 1936 cab w/Celestion V-30's
54 Fender Stratocaster hardtail
87 Fender Stratocaster
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Re: 1973 Super Lead problem
Amp's doing really well after a while now. Sounds great ! But the PT gets fairly hot after playing a hour or so. Much hotter than my 78 super lead or my '79 2203. Bias is the same...
http://oi41.tinypic.com/k9h5s.jpg
http://oi40.tinypic.com/33z7ibs.jpg
http://oi41.tinypic.com/k9h5s.jpg
http://oi40.tinypic.com/33z7ibs.jpg
- demonufo
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Re: 1973 Super Lead problem
Also the Super PA (and 50W Super PA's) were still turretboard build often well into 1975.
So I like purple, okay!!!!!!
83.7% of all statistics are made up on the spot!
83.7% of all statistics are made up on the spot!
- demonufo
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Re: 1973 Super Lead problem
Too hot to touch? Or just hot?Dries wrote:Amp's doing really well after a while now. Sounds great ! But the PT gets fairly hot after playing a hour or so. Much hotter than my 78 super lead or my '79 2203. Bias is the same...
http://oi41.tinypic.com/k9h5s.jpg
http://oi40.tinypic.com/33z7ibs.jpg
So I like purple, okay!!!!!!
83.7% of all statistics are made up on the spot!
83.7% of all statistics are made up on the spot!
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Re: 1973 Super Lead problem
After a couple hours of band rehearsal, you can't hold it longer than 5 secs.
- demonufo
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Re: 1973 Super Lead problem
Hmmm, that's not ideal. I'd be tempted to monitor what the current draw is.
So I like purple, okay!!!!!!
83.7% of all statistics are made up on the spot!
83.7% of all statistics are made up on the spot!
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Re: 1973 Super Lead problem
Damn, will measure it tomorrow. The filtercaps are new ones, with new bleed resistors. Bias caps too, and all tubes ( mullard RI power tubes ). I think it comes comes from the heaters though, because it gets hot too when it's played with the ppimv turned down, no much difference on full blast with a attenuator.
- demonufo
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Re: 1973 Super Lead problem
What voltage is your heater string sitting at?
So I like purple, okay!!!!!!
83.7% of all statistics are made up on the spot!
83.7% of all statistics are made up on the spot!
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Re: 1973 Super Lead problem
Last time I measured it , it was around 6.2V on the 240V tap (european here). So that's good ant doesn't point on a short in the circuit..
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Re: 1973 Super Lead problem
Measured some things today. Heaters are 6v, B+ 440v. The mains current in standby is 250mA and 660mA on.
That looks good, I remember the heaters were a bit too high with the 220v tap, and it got even hotter.
That looks good, I remember the heaters were a bit too high with the 220v tap, and it got even hotter.
- neikeel
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Re: 1973 Super Lead problem
I am intrgued, do you have a clip on ammeter or did you interrupt the HT line?Dries wrote:Measured some things today. Heaters are 6v, B+ 440v. The mains current in standby is 250mA and 660mA on.
That looks good, I remember the heaters were a bit too high with the 220v tap, and it got even hotter.
Neil
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Re: 1973 Super Lead problem
I took out the fuse of the mains. Did no HT measurements.neikeel wrote:I am intrgued, do you have a clip on ammeter or did you interrupt the HT line?Dries wrote:Measured some things today. Heaters are 6v, B+ 440v. The mains current in standby is 250mA and 660mA on.
That looks good, I remember the heaters were a bit too high with the 220v tap, and it got even hotter.
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Re: 1973 Super Lead problem
Hi Dries, I have your old amp now. Instead of the 47nF I put in a 22nF mustard cap and restored bright cap to 5K. While looking for info I find myself looking at pictures of my OWN amp! lol. Did you own the amp a long time? Thanks for any info you may have.
Cheers,
Pat
Cheers,
Pat