Reflektor-D builds

The two on the left hand side are nos matched, the one beside it was pulled but measures ok, the four on the right are non-matched nos.
 

Attachments

  • IMG_20200422_183310.jpg
    IMG_20200422_183310.jpg
    1.1 MB · Views: 196
When the BL JFET replacing R6 is connected like this in the attachment it provides more mA than usual to the LED and to the mirror transistors. So Vf and Vbe go up alone and combined. I would have expected two Green LEDs to be needed for over 5V total whatever the mA.
 

Attachments

  • J2MOD.png
    J2MOD.png
    3.1 KB · Views: 234
All well then. Yes, its a different sound. Resistor is passive, less internal gain more tubey but still open due to no pF added, active JFET gives much more internal gain but some pF, sounds more laboratory accurate if bit more technical.

Depends on how you want to mix those different effects in a system. Which one is the more synergistic in an occasion.
 
If you want best resistor sound put 1k Z-Foil R6. Else for active "R6" flavors try more low noise JFETs, like 2SK117GR and PF5102 from Tea. Those have less gm (yfs) but also less pF than K170BL. Vout will probably need some new small trimming in each case.
 
Thanks for the tips. Will experiment more in the future. Have the feeling some bass is missing with the jfet, however there is more depth and dynamics. Stereo image is narrower than before. Will let the components/ soldering settle for a week (and give my hearing time to adapt 😉 ) before changing anything.

Thanks again for your help and insight.
 
Yes, your description is valid. Made to can be externally sinked only (chassis usually) plus its spread across two boards. One for rectification, one for reg. 4Wire output option is also missing.
Its a small form factor reg to can arrange it near the loading application board when space is crammed. Its rectification board (named Flexy) accepts two pole or four pole reservoir capacitor. Can be mounted at a handy distance. It can support more than one Ref-D Mini units.