ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hey everyone! I’m currently recapping a Beomaster 1000 type 2316. One channel was completely quiet, it was a faulty output capacitor. I had all the right values at home so decided to recap all the electrolytics in the whole amplifier. I replaced the 125uF with 150uF, 1,5 with 2.2uF. I’m now finished with the circuit board, and most of the caps were good, a couple were bad. Everything went smooth, except for one busted solder pad. Going to be interesting comparing this one to my other that only has the output and PSU capacitors replaced. Any how, only the 3000uF PSU cap remains. I have a 4700uF in the right physical size in my stock, is it okay to bump the value of this capacitor? Can the rectifier and power switch handle it? Thanks for any input on the matter.
I wouldn't go higher than 3300uF, exactly because of the rush-in current.And of course not low-ESR.
Martin
Thanks for your response Dillen! I went with a 3300uF instead. I'm curious though, why not low esr? What I've before that's exactly what you want out of a PSU capacitor, low esr and high ripple current. Another question while I'm at it. I'm also replacing all the trim pots. What I've figured out from the schematic the easiest way to measure the rail voltage is with the negative probe at resistor (0.39ohm) 678 and the positive to chassis. Measuring idle current should also be across said resistor as well as 754, right? What should the idle current be resting at in mV? Im having a harder time with the other two trim pots, where is the easiest place to measure the voltage?
With the other two I'm referring to 101 (2K) and 112 (5K) trim pots :)
Using low-ESR filter capacitors can cause problems in a product, that wasn't designed for it.Cons are that rush-in currents can kill rectifiers and transformers, and amplifiers can go into oscillation.Pros are none.
We had an example here recently:
https://archivedforum2.beoworld.org/forums/p/41585/308336.aspx#308336