Meat Plow wrote:
On Fri, 30 Apr 2010 01:49:05 +1000, Phil Allison wrote:

"Meat Plow"

What's the URL of the schematic?

**See:

http://recordist.com/ampex/schematic...n/601schem.gif


** Wanna bet the mic input tranny is missing and /or the hum balance
trim pot is burnt out ?

How is the OP is recording, from Line or MIC? Don't remember and you
snipped the quote.

Hum balance is R-147?

OP says that the hum is present when recording from both mic and line
inputs. Sounds like a ground connection is broken somewhere around V101,
V102 or V103. Also check those tubes for heater-cathode short. Check line
record level pot and mic record level pot for broken grround connection or
open wiper.
Make sure that the bias oscillator (V103B) is running in record mode.
--
David
dgminala at mediacombb dot net