Originally posted by g1
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Traynor YGM-3 Dazed and Confused Input
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Originally posted by mozz View PostYou should be able to get on screen measurements of all the above, then save it as a preset. There will be a button or menu to let you choose between 50 ohm or 1 meg, but probably need the probe hooked in for that.- Automatic Measurements: Period, frequency, cycle RMS, mean, peak-to-peak
I have one probe. I've been scoping amp output at my dummy load box which has a BNC cable from the box to the scope. When I measure at the inputs or anywhere else I use my probe.
My dummy load box has a BNC output, 4/8 ohm switch, and an input jack (left to right).
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Originally posted by Helmholtz View Post
There should be a channel input settings menu - consult manual.
Using CH2 might show if CH1 is shot/out of calibration.
BTW, one of the most revealing amp tests is checking output power.
Takes 5 minutes if well prepared.
1K cycles/second. Turned volume up until the sine wave started to distort, then backed off.
Last edited by misterc57; 07-13-2024, 10:13 PM.
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Originally posted by misterc57 View Post
Here are my output power measurements. 13.7 VAC into 8 ohms = 23.5 watts RMS. Does this seem to high for two EL84?
BTW, from your scope display I estimate an output voltage of 38Vpp corresponding to 13.5Vrms, so pretty much in line with the DMM.
Apart from high supply voltage the amp seems to be fine.- Own Opinions Only -
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Originally posted by Helmholtz View Post
Yes, that seems insanely high, but possible with an irresponsible B+ of 400V. I expect short tube life.
Not sure how they got away with it but they did. Maybe modern tubes are more problematic. The re-issues dropped B+ to around 370V.
misterc57 , are you sure your load is exactly 8 ohm? That will make a difference for the power calculation.
Originally posted by EnzoI have a sign in my shop that says, "Never think up reasons not to check something."
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