My 2 new latest Dynaco ST-70's - diyAudio
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Old 4th October 2007, 01:10 AM   #1
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Default My 2 new latest Dynaco ST-70's

My 2 latest Dynaco ST-70's finally arrived after 1 month. I created a quick web page to show you what I got. The 2 cages have holes on top, I wonder if that was to adjust the bias. Someone must have cut the hole as my other 2 ST-70's are hole free...

Check them out at http://www.tuberadios.com/newst70/

I have to clean and polish them and the usual recapping. All the tubes are Realistic lifetime tubes as you can see on my web page.

Regards,
Sal Brisindi
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Old 4th October 2007, 03:08 AM   #2
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SWEET! I like those Big Bottles, I wonder how they stacked up to the Mullard XF2's they likely replaced? Any idea how this pair was used? Perhaps a quad setup or bridged or bi-amped?
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Old 4th October 2007, 03:19 AM   #3
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I am not sure how the tubes stack up to the Mullards or where these amps originally came from. All I need is 4 more to put 1 in every room...

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Sal Brisindi
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Old 4th October 2007, 03:41 AM   #4
kevinkr is offline kevinkr  United States
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Radio Shack apparently no longer honors the Life Time Tube Warranty - some stores around here actually have signs posted to that effect. My last attempt to get some replaced was quite unsuccessful back in 1999. They did offer to order replacements at a considerable premium over what I could get them for elsewhere.

The 6CA7 appear to be GE based on recollection. (possibly faulty.)
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Old 4th October 2007, 03:45 AM   #5
gni is offline gni  United States
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Not to sound crass. . . how much did you pay for the units?

This seem like the only way I will get a tube amp at this point. . .

If not exact price. . .maybe a range. . . .

Thanks!
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Old 4th October 2007, 07:02 PM   #6
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I didn't get such a great deal on these 2 amps as I didn't know there were holes cut on top of them and I bought them sight unseen. I paid $480 for both shipped to me. The idea was to rebuild them and sell 1 hopefully making enough money break even on my purchase price. We'll see...


Sal Brisindi
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Old 4th October 2007, 07:24 PM   #7
gni is offline gni  United States
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Worst case. . . rebuild with parts of both for one working amp
and parts to sell off!

Thank-you for being honest. . .I don't think the holes will change
the working performance of the amps. . . I like many others wait
for updates on the rebuild process.
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Old 4th October 2007, 08:31 PM   #8
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I am sure I can rebuild both of them as long as the transformers are good. The tubes all tested good except 1 7199.

Here is a document I wrote when I rebuilt my first ST-70, I have since rebuilt 3 of them and replaced all the caps including the bias caps. I have to update this doc. You can see it at http://www.tuberadios.com/newst70/restorest70.doc

Here is a photo of it with the cage off. My second ST-70 I used an upgraded quad capacitor 80/40/30/20uf instead of 30/20/20/20uf.

Click the image to open in full size.

Regards,
Sal Brisindi
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Old 4th October 2007, 08:48 PM   #9
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nice work sal... have fun!
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Old 4th October 2007, 09:10 PM   #10
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$480 shipped doesn't seem too bad....I must have 5-6 st-70's and at least as many MK-III's...was buying the st-70's for about $120...but that was in the mid 90's....

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