I picked up a Forte 1A not long ago and have also noticed that the transformer buzzes/hums. It is fairly loud when first switched on, but settles to a lower volume after a second or two. I don't think this is anything to worry about, but someone else may have a more decisive opinion on this.
Nelson Pass said:
. . . large capacitor . . .
. . . reverse bias . . .
Hi, Nelson
After having moved to a new apartment recently, I get somewhat DC from the wall AC power.
1. How large is large . . . ? 1,000uF or 10,000uF?
2. Is the small reverse bias to avoid the re-anodizing problem?
Thanks.
Regards
jH
I tried the above dc-blocker, but with 6,800uF/25V (small physical size) instead of the planned 10,000uF/50V. I arranged them for both F1 and BOSOZ.
When I turned on F1 and connected to J-Low (no others), about 90% of the buzz has gone from the transformer of F1 and the speakers. I could hear the very weak buzz when I brought my ear 50mm close to them. And, I connected all system and heard that the sound was cleaner, particularly with voices.
I had some experience of explosion of electrolytic capacitors. In general, I am very much afraid of using them whenever the use is related with over-voltage and reverse-voltage application. Nevertheless, they have been working well for continuous 6 hours. They were not getting hot. This means I might be no need to worry about another potential explosion hazard.
O . . . sorry for having interrupted the thread . . .
By the way, I expect that they will work also for Forte 1a.
Regards
jH
When I turned on F1 and connected to J-Low (no others), about 90% of the buzz has gone from the transformer of F1 and the speakers. I could hear the very weak buzz when I brought my ear 50mm close to them. And, I connected all system and heard that the sound was cleaner, particularly with voices.
I had some experience of explosion of electrolytic capacitors. In general, I am very much afraid of using them whenever the use is related with over-voltage and reverse-voltage application. Nevertheless, they have been working well for continuous 6 hours. They were not getting hot. This means I might be no need to worry about another potential explosion hazard.
O . . . sorry for having interrupted the thread . . .
By the way, I expect that they will work also for Forte 1a.
Regards
jH
jh6you said:Hi Choky
It seems that your circuit on the post #9 must have cap of big enough voltage rating. Otherwise, might BUMB !!!
Regards
jH
just for voltage sag on 100 ohms ?
another one.... didn't checked,and didn't looked too much
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Michele said:As I said, I have 2 Fortè Audio. 1 uses 4 International Capacitors caps, and the other 4 Audiovox caps, Is anybody able to say why?
I speculate that the Audiovox were put in after-market.
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