I've been busy bringing a Technics SE-A3 amp and Technics SU-A4 preamp combo back from the sonically dead.In the SE-A3 shop manual it says to use a distortion analyser between the o'scope and VTVM on the speaker jacks (while monitoring a 20khz signal from input to output,dummy load in circuit) to adjust Icq and clamp voltage.I'm missing one of those.I just hooked the o'scope and my dmm (repairing an old Simpson VOM,not done yet).I ran the output volume pot gain up to 28.28vac,as specified.Monitored both input and output.Nice clean signal all the way thru,no distortion and good gain.The vu meter showed about 150W.Got the voltage regulator set to 85.5 vdc and dc balance set to 0.00mvdc each channel,as specified.I was happy,adjusted nothing after that.Considered everything within spec.
My question revolves around the distortion analyser.I've found that with tools if I need it once,I'll need it again sometime.Some comments and recommendations please from those of you familiar with this piece of test gear.I've never used one before,seems like a handy thing to know about and use.I know they aren't cheap.I'm thinking about something used from one of the test equipment surplus dealers on the web.Something in the affordable/hobbyist range.Will I need to get one? Suggestions as to which one,please? Some info regarding their use would be appreciated also.
Thanks,
Lee
My question revolves around the distortion analyser.I've found that with tools if I need it once,I'll need it again sometime.Some comments and recommendations please from those of you familiar with this piece of test gear.I've never used one before,seems like a handy thing to know about and use.I know they aren't cheap.I'm thinking about something used from one of the test equipment surplus dealers on the web.Something in the affordable/hobbyist range.Will I need to get one? Suggestions as to which one,please? Some info regarding their use would be appreciated also.
Thanks,
Lee