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-   -   Dynaco st70 vs Heathkit W5M (http://www.diyaudio.com/forums/tubes-valves/151329-dynaco-st70-vs-heathkit-w5m.html)

Rudes 8th September 2009 06:02 PM

Dynaco st70 vs Heathkit W5M
 
Can anyone tell me which they feel is a better overall sounding/built amp?

planet10 8th September 2009 06:27 PM

Both should really be considered as donors for a complete rebuild.

dave

Vargas 9th September 2009 03:21 AM

2 Attachment(s)
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

vinylkid58 9th September 2009 03:53 AM

Quote:

Originally Posted by Vargas (Post 1919266)
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

Rudes 9th September 2009 03:55 PM

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.

planet10 9th September 2009 04:04 PM

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.

dave.

vinylkid58 9th September 2009 04:21 PM

Quote:

Originally Posted by Rudes (Post 1919725)
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

vinylkid58 9th September 2009 04:26 PM

Quote:

Originally Posted by planet10 (Post 1919733)
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

planet10 9th September 2009 04:36 PM

Jeff,

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

dave

vinylkid58 9th September 2009 04:55 PM

Quote:

Originally Posted by planet10 (Post 1919762)
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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