Excellent! I guess there are people like me who enjoy this sort of thing. Thanks for the info. I would be curious as to how you determine output transformer ohms.
Thanks Michael. Do you mean if you have an unknown output transformer and you want to know what impedance speaker (e.g. 8 ohms) it is designed to drive?
Stuart, do you have a video showing how you built your dummy load? I’m using a very simple one, and much less wattage than yours, but thought it might be good to have one like yours. Thanks.
Great channel Stuart and very helpful. Thanks a lot for the great content. Sorry if this is a stupid question but isn’t the speaker value impedance rather than resistance ? And if so isn’t the calculation slightly inaccurate ? I think I read somewhere that an 8ohm speaker is around 6ohm as a resistance value. Thanks a lot
Hmm that's actually a good point. In practice though I've always found it to be correct, e.g. 100W amp gives me about 100W, 50W amp gives me about 50W etc. Techinically you are correct though. Maybe the impedance is always pretty close to the resistance> E.g. 7.2 ohms or something. Not sure.
Hi Your comment on my Deoxit vid got bounced, probably due to the w**k word! Can you repost changing that word as I thought it was a good comment. Thanks
Very interesting video this one Stuart. I will let you know how I get on with this procedure!
Excellent! I guess there are people like me who enjoy this sort of thing. Thanks for the info. I would be curious as to how you determine output transformer ohms.
Thanks Michael. Do you mean if you have an unknown output transformer and you want to know what impedance speaker (e.g. 8 ohms) it is designed to drive?
@@stuartukguitarampguy5830 exactly
Stuart, do you have a video showing how you built your dummy load? I’m using a very simple one, and much less wattage than yours, but thought it might be good to have one like yours. Thanks.
It's nothing special. just a couple of 100W 8ohm resistors on a heatsink.
Can you fix digital guitar amps?
Hello Stuart, nice video ! What about the input signal strenght ? How do you figure out the input signal level ?
I would just measure it on the scope. A typical input signal is about 50mV
Great channel Stuart and very helpful. Thanks a lot for the great content.
Sorry if this is a stupid question but isn’t the speaker value impedance rather than resistance ?
And if so isn’t the calculation slightly inaccurate ? I think I read somewhere that an 8ohm speaker is around 6ohm as a resistance value. Thanks a lot
Hmm that's actually a good point. In practice though I've always found it to be correct, e.g. 100W amp gives me about 100W, 50W amp gives me about 50W etc. Techinically you are correct though. Maybe the impedance is always pretty close to the resistance> E.g. 7.2 ohms or something. Not sure.
this amp consumes 180W right? so it wastes 124W? 180-56=124
Yep sounds about right!
Perhaps the customer is getting older and deaf - I am !
Hi Your comment on my Deoxit vid got bounced, probably due to the w**k word! Can you repost changing that word as I thought it was a good comment. Thanks