Heavenly Red v1.0
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9
Modifications
Structure
The original only has a structure on-off. In this version I added an extra option for a second structure
option formed by
C16a
and
R13a
. After some experimenting I found the 1uF/15k combination to
have some added value, but feel free to experiment and let me know if you found a good
combination.
Pre-EQ
The original Bogner amp has the pre EQ set to switch between 470p and 4n7. The 7
th
heaven effect
(GoosoniqueWorx) uses a 1n (
C10
) which I personally prefer. But you can choose any value between
100p
–
6n8 for
C10
or
C11
.
More Gain
Upping
P1
to B1M and changing
R21
to 1M will increase the maximum amount of gain. However be
warned that the risk of squealing will also increase.
Unity
Replacing
R23
with a 10k is reported to put unity gain closer to 50% on the volume knob
R15 vs R15a, R30
The Bogner amp has
R15
and not
R15a
. The latter one was introduced in the 7
th
heaven although it is
not clear why, could have something to do with the squealing. Also
R30
is in the Amps, but not in the
7
th
heaven.
Troubleshooting
All PCB’s have been
100% factory e-tested and out of every batch I receive I build an effect to double
check, so there should not be a connection problem on the PCB itself.
The board is not working (at all), what now?
•
Check if your 9V is plugged in correctly (and/or soldered correctly on the board). Pay special
attention to the polarity.
•
Check that you oriented
the capacitors, IC’s ,transistors and diodes the right way.
SMF, MKT
and ceramic capacitors as well as resistors do not need to be oriented. A likely sign of
incorrect capacitors and/or orientation is when an effect is sputtering, rumbling or
“motorboating”.
•
Check if you used the correct values of the components. For resistors you can look here:
http://www.diyaudioandvideo.com/Electronics/Color/
•
Double and triple check your soldering! A loose or cold solder can be really bad for your
board.
•
Replace the IC and/or transistors, one might be defective. Before doing that first unplug the
9V and wait for 5 seconds.
•
Check that you have good/high grade components. A lot of Chinese sourced parts are fakes
(especially high end opamps, audio capacitors, vintage diodes and transistors) so be careful
that you source your parts from reliable suppliers.
