'67 100 watt board layout

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VelvetGeorge
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'67 100 watt board layout

Post by VelvetGeorge » Thu Aug 11, 2005 4:53 pm

With all of the interest in earlier 100 watts lately, I thought a diagram might help. This is the circuit and layout in my '67.


George
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Post by VelvetGeorge » Thu Aug 11, 2005 4:55 pm

Here's a smaller copy of the jpg.

George
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gnugear
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Post by gnugear » Thu Aug 11, 2005 9:35 pm

Is that 68k in parallel with the 10uf normal?
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'74 Super Lead rebuilt with '68 metro board and old stock mustards.
'73 Super Lead
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Post by 7string » Fri Aug 12, 2005 12:32 am

Thank You for the layout George.
Thats gonna help me bigtime.

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Post by bmf5150 » Fri Aug 12, 2005 12:33 am

thats for biasing correct?
stan

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Post by 5150loveeddie » Fri Aug 12, 2005 12:35 am

I though the mix resistors were 270K in 67?
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Post by VelvetGeorge » Fri Aug 12, 2005 12:40 am

The 68k is for biasing.

My late '67 has 470k mix resistors, but they should be 270k earlier in '67.

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Post by mightymike » Fri Aug 12, 2005 2:51 pm

Thanks George.

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Post by Ralle 500 » Fri Aug 12, 2005 6:14 pm

5150loveeddie wrote:I though the mix resistors were 270K in 67?
Those were in the JTM's
Ralle

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Post by Guest » Fri Aug 12, 2005 8:45 pm

George,

You sure you don't have a 10k/1watt resistor in series with that 8k2/1watt resistor on the H.T. line? I know the earlier '67 amps had just the one 8k2 resistor, but I thought your amp was a slighly later '67 amp. :roll:

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Post by 5150loveeddie » Sat Aug 13, 2005 1:20 am

Ralle 500 wrote:
5150loveeddie wrote:I though the mix resistors were 270K in 67?
Those were in the JTM's
Ralle
Yeah?
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Post by Billy Batz » Sat Aug 13, 2005 3:55 pm

I read an article somewhere specifically about those mixer resistors. It said you can date marshalls by the presence of 470k mixers because they started in early 67. If the amp has 270k that doesnt mean its pre 67 because they still showed up in amps after the 470k's but the 470k's started being used at a specific ttime.

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Post by Flames1950 » Sat Aug 13, 2005 3:58 pm

I remember that too but I don't remember where I read it.
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Post by 5150loveeddie » Sat Aug 13, 2005 4:20 pm

What would be the differences between the 270ks and the 470ks? Anyone knows, more gain with the 270Ks mix resistors??
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Post by Billy Batz » Sat Aug 13, 2005 4:24 pm

no. More high end less gain. 270k has less resistance between the mixer and the unused/opposite channels volume pot ground. In other words the volume controls are more interactive with each other.

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