Non magnetic resistors ? Any experience ?
wire with protect magnetic field screen and
http://www.antekinc.com/content/CA-xxx.pdf
I see Pioneer made class A amps with psu transformers covers.
wire with protect magnetic field screen and
http://www.antekinc.com/content/CA-xxx.pdf
I see Pioneer made class A amps with psu transformers covers.
Attachments
Ok anyway try this time circuits with all non-magnetic materials R.
Can't resist to interesting M2 non-feedback transformer coupled push-pull amp.
I get super Tea-Bag full kit woow yuoopiiii
Have a nice day 🙂
Can't resist to interesting M2 non-feedback transformer coupled push-pull amp.
I get super Tea-Bag full kit woow yuoopiiii
Have a nice day 🙂
try also with non-magnetic input xformer
while you're there ,use non-magnetic mains xformer , too
while you're there ,use non-magnetic mains xformer , too
I have found out that putting some small magnets in the four corners give a much better sound!
:-----))))
:-----))))
try also with non-magnetic input xformer
while you're there ,use non-magnetic mains xformer , too
Yeah shure and make sense only with non-magnetic speaker drivers 😀
Separate box for the psu donuts 😉
Just a quick midway update on my M2
So far I have installed a Schaffner filtered IEC switch
A shielded AC cable
And reworked / peplaced the star earth for neatness
"No " CL 60 was fitted to safety earth - as per Zen Mods tip
Also had my electrician friend make up a shielded power cable of the same type as the amps AC power supply cable - so now from power point to amp switch the same cable is used
Results
M 2 is still humming at same level - testing noise level on iPad with db app @ 44db as an average at speaker
Next steps are
Prepare the torodial cover and fit as time permits
Wait for MuMetal to arrive to make box covers for the Edcore transformers
If that does not reduce the hum then I'm contemplating to swap out the Toshiba 2SJ74GR 2SK170G with the spare set I have on hand
So far I have installed a Schaffner filtered IEC switch
A shielded AC cable
And reworked / peplaced the star earth for neatness
"No " CL 60 was fitted to safety earth - as per Zen Mods tip
Also had my electrician friend make up a shielded power cable of the same type as the amps AC power supply cable - so now from power point to amp switch the same cable is used
Results
M 2 is still humming at same level - testing noise level on iPad with db app @ 44db as an average at speaker
Next steps are
Prepare the torodial cover and fit as time permits
Wait for MuMetal to arrive to make box covers for the Edcore transformers
If that does not reduce the hum then I'm contemplating to swap out the Toshiba 2SJ74GR 2SK170G with the spare set I have on hand
@ Full Range
Do you try test or experiment what happen if psu transformer is out the chassais box
with much much longer distance from step-up Edcor ?
Greetings 🙂
No - but it has been suggested before in conversation
That will be my last option as I prefer one chassis
I was think about temporary "try only" option if hum is gone so jfet's are ok.
I would like to ask a question.
Is there a difference between the BL and GR JFets
The BOM recommends BL but I have purchased GR ( as per the entry below )
Toshiba Original 2SJ74GR / 2SK170GR Matched Pair (0.05 mA)
Good Detective work was spotted by Wdecho
Is there a difference between the BL and GR JFets
The BOM recommends BL but I have purchased GR ( as per the entry below )
Toshiba Original 2SJ74GR / 2SK170GR Matched Pair (0.05 mA)
Good Detective work was spotted by Wdecho
it'll work , but I presume sort of wimpy sounding
do you have 4 pairs , by chance ?
it'll help if you parallel them ......
do you have 4 pairs , by chance ?
it'll help if you parallel them ......
I purchased 2 sets - 1 set as spares just in case - But I won't bother now
It's easier to purchase the BL
The sound is not as lively as the F6
Are the ones in the DIY shop suitable for the M2
Or do I start looking
Linear Systems Matched JFET pairs (Grade B) – diyAudio Store
Thank you gentlemen - that's what makes the DIY Audio community so good
Let's hope the information will help others that follow
Will return again with a report after I order and install the new JFets
Let's hope the information will help others that follow
Will return again with a report after I order and install the new JFets