So it is all buttoned up now.WE
It is alive... no smoke so far.
Sounded awesome outside the case, but we will see what it now sound like later today.
This was so much fun to build, but I underestimated how much work with all the modifications
Have a pair of LM833 per 6L6's writeup in there for now and test others later.
I have s Preamp switch and a switch for balanced/unbalanced headphones.
Also, have adjustable gain installed to r12.
Do not have the 100ohm resistors on the preamp lines yet
Had to DIY the milling, learning as I went along,
Cable tidy-up is also needed.
Will add MUSES volume with OLED display when parts become available and KHADAS DAC after.
Would have been lost without all the forum contributions, so thanks for all the help from as usual Wayne, 6L6, avdesignguru to name a few.
Final conclusion, I love it.
listening through Beyerdymanics DT770 Pro 80ohms.
I built it balanced for two reasons:
1. To fit into the Main Stereo which is fully balanced from the Modified OPPO CD >> BAT Preamp >> Whammy
2. For the sheer fun of it.
Otherwise built stock per 6L6's instructions.
The LM833 sounds wonderfully balanced.
Some of the issues I had:
1. Plugged straight into Modded Oppo BDP105 with Sen IV mod
Sounded distorted and noisy
Hum present rising with the volume and not really acceptable
2. Plugged into Tape Out of BAT vk50se
Sounded better than above, still slightly distorted and noisy, but not as bad as 1
Hum present but lower and changes with volume knob too
3. Pluged into PreamOut of BAT vk50se (Best Solution)
Max volume on Whammy and use the Volume knob on the BAT for adjustment.
No distortion and almost imperceptible hum at Whammy max volume.
Was able to achieve desired SPL in the headphones.
Sounds absolutely amazing and this is what made me understand what everyone is talking about.
4. In options 1 and 2 above, generally, the volume output of the Whammy is low. (Using a 10k pot)
I find I can max out the volume a lot of the time, and could use more.
Searching the thread to see if there are more suitable resistance values to correct this.
Any advice as to why is appreciated.
All in, it was worth it,
Proposed future mods, just cause it was so much fun
Upgrade opamps to the BursonV6 classics. (Based on reviews, this is probably, my preferred, but may do some comparisons)
Upgrade Input CAPS
Install the Khadas DAC, Muses Volume, and OLED display.
Thanks again for a fun project.