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Title: Lashing a Dentron MLA-2500 up for 220 Line? Post by: N8ETQ on September 17, 2014, 10:34:25 AM Just looks UN-safe to me.. No fuse/switch for the other line. Thinking about GORDO's in a box on the line cord due to space issues. The Commander HF-2500's used these and they work well. Swapping the switch would require severe Front Panel metal work as well. I also like the "Zero Cross" characteristics.. Any Other Ideas? Thanks /Dan Title: Re: Lashing a Dentron MLA-2500 up for 220 Line? Post by: WQ9E on September 17, 2014, 11:19:54 AM Drake's amps are built the same way. I was very surprised when I acquired my first one and found they were only using a breaker and switch in one side of the 240 volt line. I have my radio room set up so that everything except the lights and a couple of dedicated and clearly marked outlets are killed by a main shut-off switch when the gear is not in use-otherwise I would change the protection and switching arrangement for the 240V gear that only protects and switches one side of the line.
Title: Re: Lashing a Dentron MLA-2500 up for 220 Line? Post by: WD8BIL on September 17, 2014, 11:56:29 PM Had my 2500 for 35 years with no problem. Only danger is sticking your hand in there (a very small area) or changing the jumpers with it plugged into the outlet. Not a safe procedure.
Grounding is must. Title: Re: Lashing a Dentron MLA-2500 up for 220 Line? Post by: WA2TTP Steve on September 18, 2014, 02:21:27 AM I have an Ameritron ALS600 that fuses both sides of the 220 line but only switches one side. This amp is used in my remote controlled station and I installed a solid state relay inside the power supply for remote power control. It's wired across the power switch which I leave in the off position for remote operation. I've used this setup for 2 years with no issues.
Steve Title: Re: Lashing a Dentron MLA-2500 up for 220 Line? Post by: N8ETQ on September 18, 2014, 09:45:44 AM Hey Rodger, Buddly and Steve,
This one came here a few years ago, MAR 2011 I think. Not sure it would have blown a fuse anyway but... Would hate to go to sleep with this thing cooking away like that. Op never noticed this issue, I think it was here for HV diodes. I guess I just don't trust them. /Dan Title: Re: Lashing a Dentron MLA-2500 up for 220 Line? Post by: WD8BIL on September 19, 2014, 10:56:21 AM Holy smokes! That's an old one. Still has the Twinsburg address.
Looks like something or someone got in there and caused a short to the chassis. Title: Re: Lashing a Dentron MLA-2500 up for 220 Line? Post by: N8ETQ on September 22, 2014, 04:07:35 PM Holy smokes! That's an old one. Still has the Twinsburg address. Looks like something or someone got in there and caused a short to the chassis. I don't think so, There was a large solder blob on that chincy terminal strip that was arcing to the back panel. The one I'm working on now has a serial number above 2770 still with the Tburg addy. Not sure when they moved, maybe just had a bunch of old labels. Anyway this is what I came up for the 220 Primary side on this one. A die-cast bud box with 2 fuse holders, 2 SSR's and an old 9VDC wall wart. I'm using the original switch to turn on the wall wart guts which turns on the SSR's. He still "Bangs" a bit when I hit the switch but all in all, It makes me feel better. /Dan |