4 Jun
2015
4 Jun
'15
4:28 p.m.
Len Ovens wrote:
On Wed, 3 Jun 2015, David Christensen wrote:
Len
Yes that's what it was, however the toggle switch itself said 'Ground' on
the back the amp chassis..
Both the bass player and I had vintage Traynor amps, he had a YBA-1 and I
had a YGM4 Studio Mate, If you google the model numbers you can find the
schematics, however a quick look didn't show me a schematic prior to 1973
but to my knowledge these amp models date back to the late 1960's. It
appears that the 1973 schematics show a chassis grounded plug..
In any case both of these amplifiers had ungrounded 2-prong molded plugs
and if the toggle was switched wrong with the wiring at whatever venue we
were playing at we would get shocks off of the microphones...lol
I heavily modified and sold mine to a nephew many years ago but Traynor
actually re-issued both of these amp models in recent years (with proper
electrical supplies). Had I known it was a classic... well hindsight is
always 20/20... To this day I still keep a respectable distance from
microphones when I sing...
Glen
On 06/02/2015 06:32 AM, Glen MacArthur wrote:
I don't know about ground switch, but some of them had a "hum" switch or
something similar... flipped the ac lines. Sometimes the "neutral" was
connected to chassis... which with no keying on the ac plug meant the
chassis might just as easy be hot. Nobody has done that for a long time
now. The idea was old and outdated 50 years ago. (probably before)
--
Len Ovens
www.ovenwerks.net
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... I've received a few mic
shocks to the lips over the years when I used to run a vintage amp
without
a ground (it only had a ground lift toggle switch)... It didn't take me
long to upgrade the wiring to a fully grounded cord.. :)..
I'm curious -- if an electric guitar amplifier has a two-conductor power
supply cord (with hot and neutral conductors only) and a "ground lift"
switch, what does the switch do?
Can you provide an example make and model that has a schematic available
on
the web? For example:
http://www.thevintagesound.com/ffg/