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In Reply to: RE: I'm Melting... What a world, what a world... posted by drlowmu on December 18, 2011 at 22:29:33
There is another factor here. A number of the Hammond 200 series PTs tend to have a mechanical buzzing, whereas every 300 series PT I've tried was dead quiet. I totally agree about choosing a much larger PT rating, but I would pay the extra dough and get a 300 series instead of a 200.
Follow Ups:
Just what I was going to add. In the heyday of the Hagerman Cornet/Cornet2, Jim changed the power tran from 200 to 300 series because of MANY complaints of buzzing. I think it was 272 BX but it's been awhile.
Could be that Hammond addressed the issue. In any case, I always put an .040 layer of EAR SD-40 under all my transformers and chokes.
I will believe corporations are a legal person when Texas executes one!
Hi,
You and I don't know, from a few small samples, what the real facts are on that, so its hard for me to comment, but I can't imagine there being any difference, coming from the same manufacturer. Doesn't make sense to me.
You know Dave, its possible that the people who order the cheapest iron are the most novice of builders, and so, they don't know to leave enough "overhead" in their specifications. They would order the less expensive 200 series initially.
Jeff
I agree that the samples are small. However, just do a google search for "Hammond transformer buzzing" and you'll find other people who have had the same experience.
OK, but realize, about 95% of the novice designers and builders will order Hammond, and most newbies are on a budget, so there will be a larger number of such reports, when they don't fully understand how to de-rate.
Its sorta like my Crown Vic Police Interceptor daily driver. There are LOTS of reports of rear-end crashes where the gas tank explodes and kills occupants. Tell me, does that have something to do with the CVPI's popularity as a Police Car, and being parked on the sides of the roads to give tickets? Should I fear a gas tank explosion? Well, I'm not parked on the side of a busy road, so I don't Dave.
Jeff Medwin
Would you know some of the specific model numbers which are noisy? Seems like a lot of extra $$$ to pay to go to 300 series, if you don't need the extra taps on the primary side. And what about the 50/60Hz 200 series trannies? Are they quiet?
Thanks!
I don't remember which ones I tried. It's been too long ago. I do recall that one of them was the PT spec'd in the Vacuum Tube Valley Octal Linestage. That had a nasty buzz. Sometime after I built that, I did some research on the forums and discovered that a lot of people had the same complaint about the Hammond 200 series. I then ordered a pair of 373BX transformers for some 6L6 monoblocks, and they were very quiet. Since then all of my Hammond PTs have been 300's.
My all-time most-quiet PT is the Angela Universal. I've used a total of 4 of them and they are 100% silent. I can put my hand on it while the amp is cranking away and there isn't the slightest vibration.
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