Crate G 130C G 130CXL Modifications

Page 1

MODIFIHQTIDNS TD
7w530»01/03 nRT REV. Q
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QL UV 9/1/90

MUD. #1 : Tank an H.9H (76-89; resietflr from jumper #31 to
the leg of Rluu elusest he the input as illustrated 0n the
pictorial.

This modifinatjon prevents very high level signals
From enceedinn the Vns the hjnnal frem breaking thru" when the PET is in the off
mode (chorus an).

CI T

prevents weird noises from happening when the amp i:
played at very high levels with the Chorus on.

MOD. #3 : "WFFFF two 1N754 (319754-01) zener diodes opuesjng
palarity, acress HBO as shewn on the pictorial.

This modification limits the input level to
and nrevente overloadinq hf the delay 1C (MN3007). when
the input level tn the MN3007 exceeds its rail voltaue (15v
pmp) the IE will DC at the dutput and refuse be pass a
signal until power to the 1C is cut then restored.

.3. r

Prevents weird neises and chnrus lockup" Frmm
hapneninn when khe amp is played at very hiqh levels with the
c: h or us on .

NOTE: The zener diedes of MOD. #3 must have opposing polarity.
The directimn c: the oneositidn, However, fines not matter as
illustrated be.

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MOD. #3: Change 018 fram a 1113 (95-113-01) to a ENSGEB
(96-538-01).

The EN563B FET has a lower on resistance than the
Jlle thus causing less of a voltage drop across when in
channel B which allows the channel 9 LED to be mare fully
turned off.