PP Amp kits qua Dyna ST-70?

[Downhome Upstate]

"Selenium rectifier?

Its between the power transformer and the PCB, for the bias. Replace it with a diode first thing...John

Thanks, John. Had my first look at the schematic today (the 7199 pentode/triode was a head scratcher).

 

[Grainger49]

The Curcio cap board replaces both the can cap and bias supply, Selenium rectifier.  Paully put that in his first ST-70.

 

[Paully]

Doesn't the Triod Electonics do the same?  We put that one in the current Dynaco.

 

[Downhome Upstate]

Hey, guys. Where does the selenium rectifier appear in the schematic in the product manual?

 

[Downhome Upstate]

The Curcio cap board replaces both the can cap and bias supply, Selenium rectifier.  Paully put that in his first ST-70.

I hadn't seen Curio's web pages before. As Werner Klemperer said, "very interesting." But it looks like their upgrades are for triode operation only. I'd like to get as much power out of the ST-70 as possible, and it looks like the sources for ultralinear upgrade boards and parts are at Triode Electronics and tubes4hifi.

 

[STURMJ]

The triode power supply has the caps, you still use a rectifier tube.

 

[Downhome Upstate]

The triode power supply has the caps, you still use a rectifier tube.

Yup. And for $12 they also have this solid state rectifier package that plugs into the tube rectifier socket:

http://store.triodestore.com/ssr.html

 

[Doc B]

Actually Artie Johnson said "veeery interesting", on Laugh-In.

 

[Downhome Upstate]

Ooops. Dats right. (Great pic)

 

[Grainger49]

The Selenium rectifier is the single diode (looks like it has heat sinks) for the bias supply.  It is in the front left of the chassis, I don't remember where it is on the schematic.

 

[Wanderer]

]

I hadn't seen Curio's web pages before. As Werner Klemperer said, "very interesting." But it looks like their upgrades are for triode operation only. I'd like to get as much power out of the ST-70 as possible, and it looks like the sources for ultralinear upgrade boards and parts are at Triode Electronics and tubes4hifi.

The Curio mods are the driver circuit and power supply. The output tubes can be wired pentode or triode as you wish. Joe has instructiions for triode conversion on the site.