I just completed my build, and when going through resistance tests, with course and fine controls all the way at 0db, I measure 19.7K ohm at terminal 1 and 5. However, the manual says I should read 39.7K ohm on each, so there is a big discrepancy.
All other terminals read 0 ohm (or close to) except terminal 15 and 25 which read 205 ohm, which is in range.
Resistance at terminal 1 and 5 go down when I lower the fine tuning. At -45db I read 9.9K ohm at terminal 1 and 5. I get the same reading on the lower legs of the fine tune attenuate as I do on terminal 1 & 5. Changing the course attenuate does not change the readings on terminal 1 and 5.
I get 17K ohm on the mid post of A and C with fine tune and course at 0db. This does drop as I rotate either, with both at -45 I get 130 ohm on the mid post of A and C.
I made the assumption that this would only effect the output levels, and all the wiring looks fine, so I did proceed to the voltage tests, and everything checks out in range. I tuned the A and C tubes to 145V.
If I plug in phones, they sound a bit thinner than on my less expensive amps. They just don't have the oomph of my Schiit Lyr+.
I'm testing with a Klein MM325, and also checked with an OWON HDS272S. they vary slightly but are close enough to know I am getting accurate readings.
Thoughts? Does the resistance difference change the impedance at the output jack, causing the audio to sound thin? I am using balanced out, low impedance setting into Hifiman HE1000 stealth cans. I tested audio very briefly, in case something is very wrong -- didn't want to hurt the headphones -- so the tubes have not burned in for more than a minute or two.
I understand the Lyr+ puts out a lot more power, but I did volume match it to compare. Is it just the power difference that makes the mainline seem thin, or is the resistance discrepancy indicative of an issue somewhere?
All other terminals read 0 ohm (or close to) except terminal 15 and 25 which read 205 ohm, which is in range.
Resistance at terminal 1 and 5 go down when I lower the fine tuning. At -45db I read 9.9K ohm at terminal 1 and 5. I get the same reading on the lower legs of the fine tune attenuate as I do on terminal 1 & 5. Changing the course attenuate does not change the readings on terminal 1 and 5.
I get 17K ohm on the mid post of A and C with fine tune and course at 0db. This does drop as I rotate either, with both at -45 I get 130 ohm on the mid post of A and C.
I made the assumption that this would only effect the output levels, and all the wiring looks fine, so I did proceed to the voltage tests, and everything checks out in range. I tuned the A and C tubes to 145V.
If I plug in phones, they sound a bit thinner than on my less expensive amps. They just don't have the oomph of my Schiit Lyr+.
I'm testing with a Klein MM325, and also checked with an OWON HDS272S. they vary slightly but are close enough to know I am getting accurate readings.
Thoughts? Does the resistance difference change the impedance at the output jack, causing the audio to sound thin? I am using balanced out, low impedance setting into Hifiman HE1000 stealth cans. I tested audio very briefly, in case something is very wrong -- didn't want to hurt the headphones -- so the tubes have not burned in for more than a minute or two.
I understand the Lyr+ puts out a lot more power, but I did volume match it to compare. Is it just the power difference that makes the mainline seem thin, or is the resistance discrepancy indicative of an issue somewhere?
