Actually they just need power. If it takes some current to make that then that's how it goes; the formula is described by P=Isquared x R.
When I showed at the MN Audio Society last month, the amp I used only made 140 watts and was a zero feedback OTL, not an amp known for 'current'. But I had plenty of power to drive the room no worries.
If you had enough to get 2 matched pairs per channel that certainly wouldn't hurt.
It's 1/4 inch:
http://www.diyaudio.com/forums/pass-labs/276711-sony-vfet-amplifier-part-2-a-91.html#post4581878
Cheers,
Dennis
Pass DIY Addict
Joined 2000
Paid Member
If the bracket is any more than 1/4" thick, the legs on the transistor are not likely to make it through the bracket, a mica insulator, and the reach the PCB with enough left over to solder.
Only 140 watts? That's 7 times more wattage into 8 ohms than the amp we're talking about in this thread. BTW atma, did you ever get some vfets to play with?
My Maggies were power hungry and lacked bass. Although I thought about it, I never went as far as bi-amping them. I think that the VFET 2 might work nicely for the mids and highs if the the heavy lifting is left to the subs.
Botte, how did you come to your decision to roll off at 80hz and not higher?
Well the demo went well, I was quite surprised how well the V-FET pt 2 did on the big Maggie's in a large room.
The 80hz was just an arbitrary decision and I had a cap in a box for use with my subs. Worked great, they drove it much louder than I would have expected and no one went running.
Once again people were impressed by the dynamics which on the 3.6's is saying something.
I do run my amp at a little higher bias 1.5 amps.
🙂
No pictures, so it didn't happen right?
Heh, on the side, my daughter is moving to Minneapolis for grad school at UMN this fall. Maybe one of our visits up there will coincide with one of your meetings.
Thanks for the report.
Heh, on the side, my daughter is moving to Minneapolis for grad school at UMN this fall. Maybe one of our visits up there will coincide with one of your meetings.
Thanks for the report.
Here's an update:
The DIY versions of the circuit boards are here and will be tested for errors
later today. Also I am working up the test procedures for DIYers to check
their work during the process of assembly (don't want to lose any of those
VFETs).
The samples of the brackets contained errors which are being corrected, but
I am using my own samples to do the work.
6L6 is being provided with the materials he needs to get one of his
construction guides together for this.
400 pair of VFETs have been tested.
Shouldn't be long now.
😎
The DIY versions of the circuit boards are here and will be tested for errors
later today. Also I am working up the test procedures for DIYers to check
their work during the process of assembly (don't want to lose any of those
VFETs).
The samples of the brackets contained errors which are being corrected, but
I am using my own samples to do the work.
6L6 is being provided with the materials he needs to get one of his
construction guides together for this.
400 pair of VFETs have been tested.
Shouldn't be long now.
😎
Pass DIY Addict
Joined 2000
Paid Member
Where is the cash register, where can I pay?
Please note my dire financial situation, I just need boards and Sony V-FETs, the rest I can handle in my own powers.
Please note my dire financial situation, I just need boards and Sony V-FETs, the rest I can handle in my own powers.
