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Old October 13th 03, 04:22 AM
Russell Powell
Posts: n/a
Default Potentiometer and Capacitor Questions - Can anyone help me ?

I believe the "A" is 1/4 Watt and the "B" is 1/2 Watt power ratings.
The 1M is 1 MegaOhm and the 220K is 220 killoOhm.

RAD stands for a "Radial" capacitor.


Russell Powell

Artisan Components
SR. FAE - U.S. Central


"Steve Mew" wrote in message
I am building a JCM900 Marshall guitar amplifier from a schematic and I

a parts list that I am not sure about, specifically :

Q1: Potentiometer Question -- I notice there are 8 potentiometers. There
are labelled VR1 - VR8:

VR1 - A1M
VR2 - A1M
VR3 - A1M
VR4 - A1M
VR5 - B220K
VR6 - B22K
VR7 - B220K
VR8 - B22K

Am I correct in assuming that A1M means Audio 1 MegaOhm ? Audio meaning
logarithmic ?
Also what does 'B' mean in VR5-VR8 ?
Does B mean linear ?

Q2: Capacitor Question -- I have a list of several Caps

C08 - RAD 30000uF / 30v*
C09 - RAD 33uF / 350v*
C11 - 22uF / 50v (NO POLARITY)*
C10 - RAD 33uF / 350v*

What does RAD mean ?

Any help greatly appreciated

Stephen Mew