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| | |-+  schematic to access just the power amp of my 18 watter		 « previous next »
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Author Topic: schematic to access just the power amp of my 18 watter  (Read 7660 times)
johnnierotten
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« on: January 08, 2011, 12:54:49 PM »
Does anyone have this info?  Id like to put an input to just drive the power amp so I can use a AMT SS-11 preamp. This preamp was not designed to go in the standard input of a guitar amp. Thank for any info all!
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wyatt
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« Reply #1 on: January 08, 2011, 06:34:10 PM »
You can add Nik's simple interrupt FX loop and just use the return to plug the preamp into.

http://ceriatone.com/images/mods/TMBceriatoneEffect-Loop.jpg

But to exactly answer your question, you the best pre-PI access is the wire that runs between the Normal Ch.'s Volume pot middle lug and the turret board.  On the linked pic, you'll see this wire replaced with the C and D notations for the return jack for the FX loop.

Marshall Model 1974x schematic...
http://www.ampwares.com/schematics/marshall/marshall_18watt_schem.pdf
« Last Edit: January 09, 2011, 04:56:40 PM by wyatt » Logged
johnnierotten
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« Reply #2 on: January 09, 2011, 04:22:26 PM »
Thank you for the help!!!
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wyatt
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« Reply #3 on: January 09, 2011, 04:58:31 PM »
Oh and I would buy and used shielded wire for the FX loop leads...those are relatively long wires being run across the turretboard, tube sockets, filter and B+ voltage, etc.
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johnnierotten
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« Reply #4 on: January 21, 2011, 03:12:17 AM »
Thanks Again,I appreciate it!
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