Any inputs would be appreciated.

blakey

 Price would also depend on the tubes offered koo 06:33:55 03/30/01 (1)
 Re: Price would also depend on the tubes offered blakey 15:08:50 04/02/01 (0)
 Re: Dynaco MKIV Ross 13:03:41 03/29/01 (0)

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 Price would also depend on the tubes offered koo 06:33:55 03/30/01 (1)
 Re: Price would also depend on the tubes offered blakey 15:08:50 04/02/01 (0)
 Re: Dynaco MKIV Ross 13:03:41 03/29/01 (0)
 Re: Dynaco MKIV JonM 19:06:08 03/27/01 (3)
 Re: Dynaco MKIV Todd Krieger 23:41:06 03/27/01 (1)
 Probably is the tubes JonM 08:24:37 03/28/01 (0)
 Re: Dynaco MKIV TAZSMONN 21:25:16 03/27/01 (0)

I have two ST-70s, two Mk IV's and three Mk III's (don't ask - my closet is full of this stuff!). Among my particular units, one ST-70 is sweet and lovely, one is a little grey and dry. The Mk IV's are in between the two ST-70's (smooth but they don't sparkle in the highs like that one ST-70), and the Mk III's are the greyest sounding of the bunch. (Sorry - I don't know a better term to use. Flat, grey, boring.) But I think it depends as much on the particular unit as anything - the condition of the tubes and surrounding circuitry after however many years of baking they've been through.

They are nice amps, but $600 seems like a lot to me. You need to listen to them in your system to decide if they are worth it to you.

I redid power supply and coupling caps and changed it to triode mode, it sounds nice.

Tazsmonn "The cat herder"
South Minneapolis,MN, USA, Earth
Check out where I got my system at

http://www.sasaudiolabs.com/

I've experienced similar variations in old tube gear. I'm trying to pinpoint what could account for these differences. (I've never heard a Mk. III that sounded good.)

That's why it's so hard to characterize the sound of these amps - so much depends on factors that pertain to a specific unit (tubes, how caps and resistors have aged, etc.).

Mk-4 does sound slightly different than the ST-70. Deeper tighter bass is the main difference because of the more robust powersupply vs one side of the ST-70. The MK-4 is rarer than the ST-70 an in my experience has always comanded a bit of a price premium as a result.

To my ears, both the ST-70 and MK-4 sound better than the MK-3.

I am currently having my 70AZ's restored and will let you know as soon as I get them back.

In the mean time, a friend of mine is offering me a mint pair of MKIV's for $600. I am still not sure I should jump on it or not, as, like people who responded to my post have said, the price seems to be on a higher side. I think they have Tesla EL34's. Appreciate your input.

blakey