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'68 100 watt board layout
Posted: Fri Aug 12, 2005 3:29 pm
by VelvetGeorge
Here's the standard '68 100 watt layout. Of course you will see variations and value differences.
The .68uf cap in parallel with the 820 in V2 shows up intermitantly.
The 330uf cap in V1 is often a 250uf.
George
Posted: Fri Aug 12, 2005 3:31 pm
by VelvetGeorge
Here's a smaller preview.
George
Posted: Fri Aug 12, 2005 3:34 pm
by NY Chief
How does this one sound as compared to the '67 layout? Sound clips soon, George?
Posted: Fri Aug 12, 2005 8:39 pm
by Guest
This is the slightly later '68 version with the 2k7/0.68 split cathode arrangement. The earlier version has the 820/0.68 for the split on V1. Actually, from what I've seen "most" amps with the 2k7/0.68 cathode setup don't have the pre-amp filter cap on the tag board rather Marshall already made the switch to the six top mounted filter cap style by then.
Posted: Mon Aug 15, 2005 12:47 pm
by Humbucker
Most of the '68 split cathode boards I've seen have 820 ohm/.68uf on V1b. Also, the V1 to V2 coupling cap from the bright channel should be .0022uf not .022uf.
Posted: Thu Aug 18, 2005 8:29 pm
by VelvetGeorge
Here's an updated diagram with the alternate 820 in V1 and the .0022 listed.
George
Posted: Mon Aug 29, 2005 11:04 am
by Guest
this seems pretty close to Ralle's board diagram. any chance you could post the diagram for the 69 SL board? im trying to work out which would be closest to Ralle's so I could buy the easiest one to mod, along with the necessary components at the same time.
Posted: Mon Sep 26, 2005 6:31 pm
by rockstah
i know this maybe alot to ask but can some one point which of these on the 68 board are-
Electrolytic Capacitors
Coupling/signal Capacitors
Resistors
I would really apprceiate that
Posted: Tue Oct 04, 2005 3:35 pm
by Thames
Cant see anything!
Posted: Tue Oct 04, 2005 4:14 pm
by VelvetGeorge
They should be back up later today.
There may be 5 minutes of downtime while the change is made.
George
Posted: Thu Oct 13, 2005 12:23 am
by rockstah
where is the 68 cap board layout?
Posted: Thu Oct 13, 2005 4:59 pm
by tWreCK
There is no cap board on the later '68 amps - they're all on top
Posted: Mon Oct 31, 2005 8:58 am
by rockstah
tWreCK wrote:There is no cap board on the later '68 amps - they're all on top
so a 68 build with one cap on top would be 2 100ufs and 2 32ufs as well as 16 or 32 on top?
Posted: Mon Oct 31, 2005 9:06 am
by Billy Batz
They changed around a lot. That seems like th most common. But you could also see 4 100u caps and other value can on top as well as quite a few values for the preamp can. But my estimate (Im certainly no expert on marshall history) is the values you mentioned were most common.
Posted: Mon Oct 31, 2005 9:20 am
by rockstah
Thanks Dan!