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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: ST-70 DynaMutt
PostPosted: 11 Aug 2009, 17:55 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
I must recreate amps in my own way... hence "DynaMutt" :headphones:

First, PICS!

Front:
http://geek.scorpiorising.ca/contrib/Ge ... _Front.jpg

The extra tall cage is intentional, as this is an experimenting amp to develop new driver boards on and I'd like room to do octals as well as "tallboy" minatures.


Rear:
http://geek.scorpiorising.ca/contrib/Ge ... 0_Rear.jpg

The speaker posts are all the standard 3/4" from common, so swapping speakers of different impedance is as simple as "pull-twist-push".

The Standby switch is needed for swapping triode/UL modes.

The confusing model number comes from the actual owner of the amp, Planet10-HiFi (I just get to play with it :D )


Top:
http://geek.scorpiorising.ca/contrib/Ge ... 70_Top.jpg

The chassis top is 2mm aluminium of a temper that makes it useless for bending. Reinforcement is not needed.

However, their is ample support from the wood... it's actually slotted and slides onto the sides/back from the front, then the front is screwed on.


Geeky stuff...

Power Supply:
http://geek.scorpiorising.ca/contrib/Ge ... _power.gif

This actually all fits on a 2-3/4" x 6" perfboard. It just looks so complex on paper. Well, the bias controls are on the chassis underneath.

Y'know, all those caps and bleeders are still ~$20 cheaper (landed) than one of those darn can caps :confused:


Output Stage:
http://geek.scorpiorising.ca/contrib/Ge ... output.gif

As simple as the original... almost. A little bit of protection in the cathodes.

Driver schematic isn't included, because it's the one from KTA-HiFi here (.pdf), only I used nearest 5% resistors.

Original designs I make for this, I'll post in their own thread.


Cheers!

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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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 Post subject: Re: ST-70 DynaMutt
PostPosted: 12 Aug 2009, 12:21 
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Joined: 28 May 2008, 21:53
Posts: 4577
Location: Winnipeg, CANADA
Very nice Gregg. :up: Did you build this for Dave?

I like the layout of the binding posts for the three impedances. I will steal that layout for a project somewhere down the road! ;)
Cheers

_________________
[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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 Post subject: Re: ST-70 DynaMutt
PostPosted: 12 Aug 2009, 17:03 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Thanks Gio!

Yup, Dave's amp it is.

How the story goes is I needed an ST-70 to R&D new drivers for her. Dave had a couple of dead ones on the shelf and said I could use one if I make it work 8-)

You planning on meandering out to the Victoria Audiofest in a week's time? We can give the tubes a workout :lildevil:

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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 Post subject: Re: ST-70 DynaMutt
PostPosted: 13 Aug 2009, 12:54 
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Joined: 28 May 2008, 21:53
Posts: 4577
Location: Winnipeg, CANADA
No, I won't be making it this year. Trips to the Left coast are pretty rare for me, but I will make it out one of these years. You guys have a great and large community of DIYers out there. I wish we had a bigger crowd in Winnipeg.
Cheers

_________________
[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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