Calling Rockstah - 1959 HW to 12xxx series spec

rockstah · Post by **rockstah** » Thu May 10, 2007 12:54 am

your amp is split cathode.

also try following the wires on the first preamp tube - V1 where do they go?

v1a or the normal channel has
pin1 - plate = blue
pin2 - grid or input = green
pin3 - cathode = yellow
v1b or the bright channel has
pin6 plate = blue
pin7 - grid = green
pin8 - cathode = yellow

Mark

vkaxeman · Post by **vkaxeman** » Thu May 10, 2007 1:03 am

Excellent! Very Helpful! I will study this in detail.

Thanks again for your time and help!

neikeel · Post by **neikeel** » Thu May 10, 2007 6:24 am

Your labels are almost correct.

What you have labelled as V2a cap is actually a .022uF coupling cap for V1.

The V2a is the 0.68uF cap lying across the 820ohm resistor 6 turrets along from the one you labelled

rockstah · Post by **rockstah** » Thu May 10, 2007 10:06 am

neikeel wrote:Your labels are almost correct.

What you have labelled as V2a cap is actually a .022uF coupling cap for V1.

The V2a is the 0.68uF cap lying across the 820ohm resistor 6 turrets along from the one you labelled

and thats the way i labeled it. i do know where v2a is.

v1a and v1b's coupling caps are labeled as well. look again.

neikeel · Post by **neikeel** » Thu May 10, 2007 10:48 am

Marc

I was not referring to you

I meant vkaxemans post on the 9th at 11.25 where he marked some up on his amp.

rockstah · Post by **rockstah** » Thu May 10, 2007 12:58 pm

DOH! * SLAPS FOREHEAD! *

darrell · Post by **darrell** » Fri May 11, 2007 12:20 am

rockstah
What kind of output tranny do you use in your amp?

rockstah · Post by **rockstah** » Fri May 11, 2007 12:22 am

im really liking Georges dagnall clone and his dual PT.
in some clips im using cerrems and in some in using mercury.

vkaxeman · Post by **vkaxeman** » Fri May 11, 2007 1:49 am

RE:

Your labels are almost correct.

What you have labelled as V2a cap is actually a .022uF coupling cap for V1.

The V2a is the 0.68uF cap lying across the 820ohm resistor 6 turrets along from the one you labelled
_________________
Neil

I edited and revised the picture. Please review and let me know if it is correct now. The amp is labeled Volume 1 and Volume 2 and not Normal and Bright so I may have that part of the component descriptions wrong. I have not had a chance to actually trace the wires as Mark has suggested. Currently working 2 jobs day and night. No fun

THanks for your help everyone!

yngwie308 · Post by **yngwie308** » Sat May 12, 2007 3:09 am

My HW wasn't a real Marshall until George 'returned' it to stock

!
yngwie308

vkaxeman · Post by **vkaxeman** » Sun May 13, 2007 1:50 am

Hey yngwie308!

I read your posts and I found the mods George did to your HW amp:

Parts were:
Metro Amp Dagnall clone output transformer
(1) F&T 16 x 16uf can
(2) F&T 32 x 32uf cans
(2) Sozo Vintage .68uf
(2) Sozo Vintage .1uf
(7) Sozo Vintage .022uf
(7) Allen Bradley NOS 1/2 watt CC resistors
(3) Tung Sol Reissue 12AX7 preamp tubes
(4) Mullard Reissue EL34 Matched Quad output tubes

Do you have any audio files of your amp that I can listen to?

Thanks!

rockstah · Post by **rockstah** » Sun May 13, 2007 11:28 am

vkaxeman
arent u getting sidetracked here?

yngwie308 · Post by **yngwie308** » Sun May 13, 2007 12:28 pm

Don't know why you say that Mark,George told me that the HW with the changes,short of circuit alterations,is pretty close to his 1200,short of the plate voltage switching,I thought

No no sound clips yet,I am currently getting my playing together more and hope for clips soon,I don't particularly want to have a Van Halen sound,so I am happy with my amp as it is

!
yngwie308

rockstah · Post by **rockstah** » Sun May 13, 2007 12:45 pm

i say it cause i already told him exactly what to do. steps and all.

yngwie308 · Post by **yngwie308** » Sun May 13, 2007 4:53 pm

Oh I see,slaps back of head and hears rattling

!!
yngwie308