Thanks for sharing your thoughts. Based on your findings, the standard B1 would be of great interest to me. Although, extra warmth is welcome by some -- I prefer neutral and dynamic.
octes of 2SK170-BL
NicMac, a forum member, sells selected octets of 2SK170-BL.
This is an example.
View attachment 720077
NicMac, a forum member, sells selected octets of 2SK170-BL.
This is an example.
View attachment 720077
Keep in mind standard B1 has no gain. If you need gain, you can either add step up transformers or possibly wait for NuTube version of B1 and adjust grid bias for minimum distortion, which is plate voltage at somewhere around the 1/2 supply point. I'm currently listening to Pete Millett's circuit (which uses mosfet buffers) at a plate voltage of around 9.5 VDC on a 24 VDC supply. Pretty heavy on the 2nd harmonic.
For me it is fine with Toshiba/LS parts as long as they are obtainable.
LS parts are made today at least? …..so why not just make one version?
LS parts are made today at least? …..so why not just make one version?
Pass B1 Korg
Looks like the large caps are 1000mfd-different from 2200mfd on the schematic? Are 2200mfd still OK to use? Thank You
Looks like the large caps are 1000mfd-different from 2200mfd on the schematic? Are 2200mfd still OK to use? Thank You
Sorry, the attachment is not correct. I try again.
An externally hosted image should be here but it was not working when we last tested it.
It would probably be something like the difference between $49 and $99 in the store.
Ok......I was thinking if only one version should be handled (the expensive) then this version would be a little bit cheaper than if two versions should be handled. I would go with the expensive (best components). Compared to the time it takes to finish such an amp.....the price difference is not important for me…...but maybe it is for other…..
I think 50 bucks is significant in a preamp circuit. Is this just a pinout thing plus possibly some resistor values? If it comes down to only making one board version available, I vote for the LS pinout and I can cross the legs on the J113s if I decide to use them.
How about a second set of holes at each jfet location with the alternate pinout? Seems like there is enough room and the double sided through hole plated board construction should make it relatively easy to lay out.
Done. New artwork will accommodate DGS and DSG pinouts and
current source degeneration resistors on the buffers.
current source degeneration resistors on the buffers.
A Big smile from this particular DIY enthusiast. Lacking an Audio Precision, it would eventually be a helpful starting point to know the recommended plate voltage for minimum distortion, unless Ea = half the voltage present on the supply side of the plate resistor is good enough.
Just my 2 cents:
I think the true value in DIY HiFi is to create high end audio on the cheap. For those just interested in the savings side and not the high end, there are better alternatives; even kits that are pre-assembled (like Parts Express, etc). Pete Millett has his own schematic and board for which people can source their own components. When considering a $50 difference, I think most would take the plunge for the higher end kit.
So here's one vote for the high end option. I am hoping for a way to get notified when the kit is for sale.
I think the true value in DIY HiFi is to create high end audio on the cheap. For those just interested in the savings side and not the high end, there are better alternatives; even kits that are pre-assembled (like Parts Express, etc). Pete Millett has his own schematic and board for which people can source their own components. When considering a $50 difference, I think most would take the plunge for the higher end kit.
So here's one vote for the high end option. I am hoping for a way to get notified when the kit is for sale.
Lacking and Audio Precision as well.....
i use a UCA202 DAC (20$) with my old laptop to do the measurements
Softwares are: Audio Tester, REW and Arta
After having destroyed two DAC i built an attenuator following a schematic by DM JOFFE (?) i found somewhere here around. Helps a lot
I really would want some means to see the distortion when setting the bias for the Korg triode. The changes in distortion pattern are a lot! In my case i use a setting of well out of half supply voltage.
Attachments
Although the B1 is on PassDIY, it sounds like maybe this will be sold through the DIYaudio store. Just get on their emailing list. They usually send out new stock updates.