Hmm…the Hubble had technical problems after initial launch. Probably not related to resistor values🤞
You must mean R10 as R8 is 0.75R.
0.36R is better than 0.30R. 0.36R will drop a tiny bit more voltage but it will do a bit better at power supply filtering.
0.36R is better than 0.30R. 0.36R will drop a tiny bit more voltage but it will do a bit better at power supply filtering.
Any suggestions on where to find the lsk170 and lsj74? I found all other items from mouser.
Thank you
Thank you
You can buy them at diyaudio store.
https://diyaudiostore.com/collections/jfets/products/matched-jfets?variant=39335247020105
https://diyaudiostore.com/collections/jfets/products/matched-jfets?variant=39335247020105
Hey,
I had a question regarding those two JFETs as well. DIY Store has the LS LSK170 but not the LS LSJ74, They only offer the Toshiba 2SJ74, So the question is can I mismatch brands, get the LS LSK170 and mix it with the TSHB. 2SJ74, or should I just get them both Toshiba?
Thank you all for your help.
You need matched K170/J74. Get this -
- NP Quad (NNPP)
- Toshiba 2SK170/2SJ74 Quad Idss 8-11mA - $45
Subbu, those black resistors look so cool, especially on the red backdrop of that PCB. What brand/series are they?
You can mix the Toshiba and LS. Recommended that each polarity N or P from the same source
for best results.
Those are VISHAY RS series. The part numbers are RS02B1R000FE70, RS02BR7500FE12.
I'm pretty sure 6-8mA is correct. It's somewhere in the first few pages of the thread.
Look in the document the schematics: the bridge between wiper and cw pins is included. So it can be used with higher idss than 6 ma.
The first set of boards did not have the pot wiper connected to the cw pin in spite of the schematic, but was not an issue with 6 ma Idss. At higher Idss it would eventually compromise the Vds window of the input jfets.. Not a big issue, but the bridge (found in future version) allows Idss above 8 ma without issues.