ST-70 DynaMutt
Posted: Mon Aug 10, 2009 5:09 am
I must recreate amps in my own way... hence "DynaMutt"
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/Geek/02_-_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 )
Top:
http://geek.scorpiorising.ca/contrib/Geek/03_-_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 damn can caps
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 here (.pdf), only I used nearest 5% resistors.
Original designs I make for this, I'll post in their own thread.
Cheers!
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/Geek/02_-_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 )
Top:
http://geek.scorpiorising.ca/contrib/Geek/03_-_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 damn can caps
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 here (.pdf), only I used nearest 5% resistors.
Original designs I make for this, I'll post in their own thread.
Cheers!