Late '68, early '69 restoration
Moderator: VelvetGeorge
- Bainzy
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Fantastic restoration job George - I'd like to feature this on PTPCircuits.com if you and the owner don't mind. Where did you get hold of the vintage style carbon films for the voltage dropper resistors?
"I want to know what happened to the plans they sent you"
Shred Guitar
Plexi Mods - now with new forum, please join!
Shred Guitar
Plexi Mods - now with new forum, please join!
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Now I am actually excited to send my '69 super bass to George for a cap job. I think those old mustard caps are getting tired after almost 40 years of tone. do you recommend installing the NOS mustards or the new Sozo vintage plus. I understand that the NOS mustards are not holding charges like new caps, and it is best to install new ones. any thoughts on this??? Nos Mustards v. New Sozo +
68 Marshall JMP 100 Plexi
69 Marshall JMP 100 Plexi
71 Marshall JMP 100 Metalface
66 BF Fender Pro Reverb
67 BF Fender Super Reverb
69 Marshall JMP 100 Plexi
71 Marshall JMP 100 Metalface
66 BF Fender Pro Reverb
67 BF Fender Super Reverb
- MacGaden
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Doing a cap job means changing the big electrolytic caps, not the small mustard caps, unless one or two is defective. Some "Techs" change them, and charge you for it, to sell them...
They are getting very expensive. Don
They are getting very expensive. Don
MacG.
"Play it right, Dad ! No More Dwiddely Dwiddely !
My son Adam at 3 years old. Best advice I ever got..
"Play it right, Dad ! No More Dwiddely Dwiddely !
My son Adam at 3 years old. Best advice I ever got..
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- neikeel
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It is funnny but Ihave been studying this pending my early 68 superlead rebuild. It has the original OT (in the 'wrong' orientation) but is drilled for the later OT in the 'correct' orientation with grommet holes and everything, wierdFlames1950 wrote:Jesus, that chassis looks like swiss cheese....how many different OT's have been on that thing??
I really appreciate that only six holes were added to my Super PA chassis now.
Neil
- neikeel
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I am trying to put another pt in my 69 i noticed on this amp the square rectifier has a wire going to the switch?? On my amp theres a black wire coming from the pt to this lug on the recifier ( the one at 110clock)
69 SuperBass Plexi
12000 Series Bulid
73 1987
68 Nos 50 build
2554 Combo
2550 Silver Jub stack
71 LesPaul Deluxe
68,71,73 4x12
12000 Series Bulid
73 1987
68 Nos 50 build
2554 Combo
2550 Silver Jub stack
71 LesPaul Deluxe
68,71,73 4x12
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actually it was HT lead?? I cant remember what it was called exactly but on my new PT it used a grey and a blue wire that went to the square rectifier. at 110clock and 5 oclock. the red wire at 7 oclock jumped to the filtercap and the one at 1 oclock went to the grnd on another filter cap. I replaced to aftermarket PT from the 80's with a Marshall RI P.T. changed my voltages. Now I have right at 450 +/-! Amp seems to sound not quite as dull plus the hum is gone. I figured I use this PT for now untill I could find an original.
69 SuperBass Plexi
12000 Series Bulid
73 1987
68 Nos 50 build
2554 Combo
2550 Silver Jub stack
71 LesPaul Deluxe
68,71,73 4x12
12000 Series Bulid
73 1987
68 Nos 50 build
2554 Combo
2550 Silver Jub stack
71 LesPaul Deluxe
68,71,73 4x12
- neikeel
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The grey and blue will be non-rectified HT ac (some amps used two light blue wires. The other end of the bridge is the rectified HT and will go to the fuse and the mains filtercaps (usually a red wire like yours). The opposite end of the rectifier bridge goes to earth by a black wire, usually to the earth lug on one of the PI mounting screws. I thought that this was the wire you were referring to!beaulieu wrote:actually it was HT lead?? I cant remember what it was called exactly but on my new PT it used a grey and a blue wire that went to the square rectifier. at 110clock and 5 oclock. the red wire at 7 oclock jumped to the filtercap and the one at 1 oclock went to the grnd on another filter cap. I replaced to aftermarket PT from the 80's with a Marshall RI P.T. changed my voltages. Now I have right at 450 +/-! Amp seems to sound not quite as dull plus the hum is gone. I figured I use this PT for now untill I could find an original.
Glad it sounds better!
Neil
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this is called late 68 early 69 resto!! Was there any 68 100 watt amps with standup P.T.? I have a plexi paneled 100 watt and the serial # and insp tag are gone. It has an stand up pt so I figured it a 69. I guess its best to say its a 69? correct? I would suspect no 68's with a stand up PT. Also it has the filter caps up top!!
69 SuperBass Plexi
12000 Series Bulid
73 1987
68 Nos 50 build
2554 Combo
2550 Silver Jub stack
71 LesPaul Deluxe
68,71,73 4x12
12000 Series Bulid
73 1987
68 Nos 50 build
2554 Combo
2550 Silver Jub stack
71 LesPaul Deluxe
68,71,73 4x12
- VelvetGeorge
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