When testing the ST-120 I will put a dummy load on the speaker terminals, A 100 watt 8 ohm resister on each side. Input a sine wave at about .75 V. and short out the input not being used. To measure a sine wave through an SP-14 is it necessary to have a dummy load and short the input? I have an audio generator and an Oscope. Whats the technique for testing a pre-amp?
2 posters
Proper technique to test a pre-amp
Mr C- Posts : 99
Join date : 2019-07-11
Age : 69
Location : Visalia CA.
Roy Mottram- Admin
- Posts : 1838
Join date : 2008-11-30
no load required. I usually input about 2v p-p (about 700ms rms) and at full volume you should have around 18v p-p output.
Most important tests are already in the build manual. Check B+ voltage and voltage across D13
Most important tests are already in the build manual. Check B+ voltage and voltage across D13
Mr C- Posts : 99
Join date : 2019-07-11
Age : 69
Location : Visalia CA.
Thanks Roy.