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I believe 70% is received wisdom of max idle current? Unless you are using the 1 ohm method which might allow for screens draw.
It’s not really as accurate as the 1 ohm method measures total cathode current which consists of anode current and screens current added together...
Very under-rated band.
But it is not to do it well. He will need new handles, rivets, cups and don't forget the small check (that makes it relatively rare/unusual) is...
Oh and the extra pics confused me - it is Ray's amp that has the 500pF over the plate - not yours
However the shielded wire on yours is a mod and...
I suspect the hiss is the high end gain you are hearing.
I is exacerbated by the 1000pF cap over the gain pot, it will go when you play!!!
Most of it looks ok
The 500pF over the plate resistor is to trim off some fizzy highs
The pics of the above are where the funny...
I am waiting on final confirmation with forum member.
Hope to know soon.
Ok, only neither of my SGs have P90s, although my DC Special does!
To bias this correctly all you need is a good DVM that goes up to 600v and insulated clips or a steady hand.
Very simple and very easy, no special...
I have found that with Gibsons (at least older ones) you really do need to play them to get the feel from them - despite the standardised...
Ok - so you did not buy the one in the link? Looked pretty good to me.
In my experience it should be running KT66s as it has z of 4k which matches the 8k that a two cylinder JTM45 runs. An EL34 amp for 4 tubes @ 100w...
Nice wall art tho'
HNAD, looks straight and tidy
But, take care because the more you try the worse it gets.
Plug a good Les Paul into JTM45/100 through a quad of...
You mean like the top one here that I built?:
I could be tempted to sell as part of my 'rationalisation'!
I cracked when we got to 40 amps and projects! Hence me selling some duplicates.
Still have another couple I want to do tho’ - later!
If you struggle I have the caps and correct socket.