B1 with Korg Triode

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#5,162
Wayne Colburn designs the Pass Labs preamps. 😀 Has for the last 25yr or so...

The Muses 72320 is used as the volume control in all the current Pass Labs preamps, including the XS.

That’s a good enough endorsement for me to want to try it!! :yes:


🙂 🙂 🙂
 
#5,163
I am very keen to try the Muses on my Build, I have listened to the Korg B1, with a variety of Volume Controls on board.
From Dual Toco's , a Single Pot, Stepped Att, and a Promethius AVC.
The Muses was to let the other owners of the KB1 have a listen to Muses.

I am even more Keen Now ! after being informed it has a inbuilt balance option.

My Investigations to date have been to produce a Dual Mono Volume Control using the Muses to offer the same experience as my Slagle AVC can offer to control the volume on each channel.
The inbuilt Balance Control should I hope be a decent alternative.
 
#5,166
Put bib on some dissipation metal.

From Ultra-Bib guide:

Transformers
You should choose enough secondary voltage for the rectified DC across C1 (Vin) to reach 5V higher (or more) than your Vout setting. Rectified DC=(VAC*1.414)-1.4V diodes drop. Use 9VAC for 5- 7Vout, 12VAC for 8-10Vout, 15VAC for 11-15Vout, 18VAC for 16-19Vout and so on and so forth up to 33VAC max secondary not to burn a JFET. The reg works even with less than 5V difference because CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's parasitic capacitance. For VA choose transformers with three times the power of your CCmA*ACV across all their utilized secondaries. A 50VA toroidal transfo for up to +/- 300mA CC should suffice.
 
#5,167
Just adhered the 6L6 promoted Prismacolor Magic Rub eraser via double-sided tape onto Korg Nutube. Some magic was acheived, as there was an immediate elimation of microphonic ringing. A $3 pack is $4 at Staples. I could not find any other local store that carried them. I am wondering if making four chassis feet out of the remaining two erasers (cut each in half) would further help. May give it try. Thanks, 6L6!
 
#5,171
sov said:
Put bib on some dissipation metal.

From Ultra-Bib guide:

Transformers
You should choose enough secondary voltage for the rectified DC across C1 (Vin) to reach 5V higher (or more) than your Vout setting. Rectified DC=(VAC*1.414)-1.4V diodes drop. Use 9VAC for 5- 7Vout, 12VAC for 8-10Vout, 15VAC for 11-15Vout, 18VAC for 16-19Vout and so on and so forth up to 33VAC max secondary not to burn a JFET. The reg works even with less than 5V difference because CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's parasitic capacitance. For VA choose transformers with three times the power of your CCmA*ACV across all their utilized secondaries. A 50VA toroidal transfo for up to +/- 300mA CC should suffice.
Click to expand...

Thanks - newb alert so please bear with me if you can.

So, if the transformer secondary VAC is 25V, then rectified DC across C1 = (25*1.414)-1.4 = 33.95V which is greater than 24+5 = 29V so a good choice Voltage-wise.
My understanding is that the B1K circuit draws less than 100mA CC, so a 50VA transformer should be ample.
 
#5,173
Hadox said:
My understanding is that the B1K circuit draws less than 100mA CC, so a 50VA transformer should be ample.
Click to expand...

Go for it 🙂
 

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#5,178
MeanWell interference

Hey there, I am having mixed results with the Meanwell PSU, it seems to randomly start oscillating and radiating really nasty RF, which gets picked up by various other components in the chain. I have a krell preamp, which is particularly susceptible. anyone else having problems with those little Meanwell powersupplies?
 
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