Ha. Easy questions. The most hard-to answer, aye! Watched Six Shooter?
- RV1R / RV1L (10k trims)
People, do you read boms/schems???
No, I don't want to be a bitch, but this IS your homework.
BOM:
http://ij-audio.com/downloads/mixbuzz1_docs_v2_4.rar
folder: filters
read the bom.txt;
what is the next after:
2 10K 22 TURN TRIM-POT RV1L, RV1R???
The right answer wins...ahm...whatever))))
Same BOM
Folder: PS
POWER_SUPPLY_BOM.txt
Opens same on Linux, Win, Mac, readable,
CP5, CP6, CP8, CP9, CP11, CP12, CP13, CP17, CP18, CP21, CP22
All is here.
If these components are missing, feel free to ask, I will ship them.
Or, they should cost about $0.5 at your close to home electronics parts store, a way faster to get them; tell me the cost, will refund.
Also, is it OK to have OPA604 on the quad-vca boards (C8/22pF omitted).
I prefer this kind of questions.
The op-amp on VCA boards has no any deal with sound/coloration, but precision at unity gain.
Answer: Yes. This op-amp has same output current capability as NE5534 (output current is important here)
but way better DC characteristics (less DC offset); this way, more chances to get precision tracking of both channels.
Mean, NE5534 from same batch can have more DC offset range; I had an issue with MixBuzz500 where initial gain of channels was
0.8 db difference due to DC offset of NE5532, fixed with replacing 4-5 chips, measuring the gain w/o compression/makeup
and finding 2 chips with low DC offset to get channels +/-0.05db at unity gain. OPA604 is way more precision thingy.
Same thing BTW with IC1/3/4/5; using LF412/AD712/AD713 in place of detectors op-amps will not add anything to sound, but $20 to price
and NAZI precision to channel's tracking; well, all resistors should be 0.5% as well in this case. I mean, when we are at 20 db of gain reduction at any settings, both channels should have precision tracking (same GR amount). I had a bunch of AD713's from surplus store, IIRC, $20 for 200 chips; this way is more preferable
And also OK to have OPA604 on IC4L / IC4R position?
Of course. At your taste, try different op-amps and listen.
My fav is OPA604 (if I was ables to puts here my fet- cascode DOA with DC servo, I was do thats
Say, OP275 can be very nice if 4xTHAT2181 used. This opamp loves low feedback resistor's impedances, so,
R3L/R=4k99 with OPA275 is great marriage. But, OP275 out of my interest here (it is
dual , not SINGLE as 604/5534, thus will not work)..
Heh! I will be happy to find after some posts, "I put OPA275 in place of ic4 and it smoked".
Nevermind, my bad feel of humor.
In general, precision, fast op-amp will work fine at the place of IC4L/R.
Silver mica caps if OPA604 used at place of C1L/R makes subtle sence, COG is fine with 5534.
Huh. Came home tired, but in perfect mood, after I finished my long work day in Tel Aviv, we did some listening tests
in studio with new version of Albatross pre-amp. It worked! Hurray! But, fastest way from T-A to Haifa takes hour at least,
usually, closer to hour and half..and I cannot sleep when moving
Now, kill me, tired like sh*t and needs 5 hours to sleps.
