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c. Connect the volume control (1M, A = audio taper) to the tonestack:
i. Solder the wire from the center (wiper) lug of the tonestack treble pot to the left lug of the
volume pot (
ii. Connect the ground wire from the tonestack (from the junction of R3 [10k] and C4 [3.3n] of
the tonestack; Figures 13-15) to the right lug of the volume pot (
seen from the back, as in Figure 15
5 cm of wire to that lug. Then solder.
iii. Solder some 4 cm of single stranded wire to center lug of the volume pot.
Right lug (to
circuit board
ground)
Figure 15. Tonestack and volume control assembly.
d. Connect volume control and tonestack assembly to the circuit board:
i. Cut a length of about 15 cm of speaker wire, separate the two strands and solder one
strand to the rear hole of the removed R58 (Figure 16 – "wire to tonestack").
ii. Solder the other end of the wire to the tonestack "IN", at the junction of C1 (330p) and R1
(100k) of the tonestack; see Figures 16, 17 and 18.
iii. Solder the ground wire from the volume pot (left lug, see Figure 17) to the leftmost hole
(seen from the front of the circuit board) of VR1, the original volume control (Figure 17).
iv. Solder the signal ("OUT") wire from the center wiper of the volume control to the left hole
of the removed R24 (Figure 15, "signal out").
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www.cosmicampworks.com
- The Ultimate Harley Benton GA15 Mod Kit- Version 1.4 - 200127
®
NOTE: seen from the back, as in Figure 15, it's the right lug
). Before soldering, also connect a short piece of some
GROUND wire
from tonestack
Left lug
(signal from
tonestack)
Volume
(1M (A))
Signal OUT
14
NOTE: it's the left lug if
Treble
(500k (A))
Dedicated to the Advancement of Stellar Tone!
).
Tonestack IN
(from rear
hole of R58 –
Figure 11)
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