Dynaco st70 vs Heathkit W5M - diyAudio
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Old 8th September 2009, 06:02 PM   #1
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Default Dynaco st70 vs Heathkit W5M

Can anyone tell me which they feel is a better overall sounding/built amp?
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Old 8th September 2009, 06:27 PM   #2
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Both should really be considered as donors for a complete rebuild.

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Old 9th September 2009, 03:21 AM   #3
Vargas is offline Vargas  United States
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I personaly have done both and I really like the W5M's. I used the triodeel driver board and did all the usual upgrades on the St-70 and for the W5M's I just did some simple upgrades such replace all the electrolytics, metal film resistors, Hovland musicaps and a set of Golden dragon Kt-66's and I must say the W5M's sounded very nice! They even spent a week at the local Hi-Fi store for some auditioning. Either one will make a very nice amp/amp's. The St-70 is all on the same chassis and with the W5M's being monoblocks= two of them for stereo= twice the space and twice the upgrades. One thing to beware of though is that the W5M's are notorious for the power tranny going bad! It will happen, it's just a matter of time. Once this happens you are stuck with trying to find a original replacement. I personally liked the W5M's better. Just my .02 Cheers
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Old 9th September 2009, 03:53 AM   #4
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Originally Posted by Vargas View Post
One thing to beware of though is that the W5M's are notorious for the power tranny going bad! It will happen, it's just a matter of time. Once this happens you are stuck with trying to find a original replacement.
Heathkit must have sold replacement PT's for a while. I've seen W5's with larger power transformers in square black boxes like the one that's on my W4. Mine has cloth covered leads, so it's not a newer model.

Jeff
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Old 9th September 2009, 03:55 PM   #5
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Thanks for the replies...I have 2 w5m amps with the larger output trans that I picked up at a garage sale for 10.00. The power trans was not working in one and I used a Hammond as a replacement. I just picked up a used original trans that I will install. I have one st-70 with the GSI Fuchs board and another with the VTA board. I have not hooked them up for comparison yet.
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Old 9th September 2009, 04:04 PM   #6
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I should mention that Gregg-the-Geek brought an amp he calls DynaMutt based on an ST70 to the just passed VI diyFest. It was outstanding. I understand that new input boards will be available once he finsihes the R&D.

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Old 9th September 2009, 04:21 PM   #7
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Originally Posted by Rudes View Post
The power trans was not working in one and I used a Hammond as a replacement.
I noticed that Hammond now list potted versions of their "classic" series trans. Coincidentally, they are very similar to the Heathkit's.

Jeff
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Old 9th September 2009, 04:26 PM   #8
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I should mention that Gregg-the-Geek brought an amp he calls DynaMutt based on an ST70 to the just passed VI diyFest. It was outstanding. I understand that new input boards will be available once he finsihes the R&D.
It was most excellent, and seriously embarrassed a couple of new commercial amps.

Jeff
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Old 9th September 2009, 04:36 PM   #9
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Jeff,

I think Chris' Joida is leaning towards this... if his falls, how far behind is yours?

dave
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Old 9th September 2009, 04:55 PM   #10
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I think Chris' Joida is leaning towards this... if his falls, how far behind is yours?
Maybe not too far. Like the stock Dynaco, without a new chassis, it's pretty hard to go crazy. There isn't a lot of room for extra stuff. It's definitely going to get some CCS mods thou.

Jeff
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