See if you like it... See post #1
Remember the 3 rules of maximum bias… stop when you reach any of these -
Heatsink of 55C and/or Transistor pin 2 65C
Total bias , both channels, (in watts) of no more than 1/2 the power transformer’s VA
1/2 the maximum dissipation (in watts) of the output device. In the case of the IRFP240, it’s a 150W device, so no more than 75W. (Which is really, really hot…)
Remember the 3 rules of maximum bias… stop when you reach any of these -
Heatsink of 55C and/or Transistor pin 2 65C
Total bias , both channels, (in watts) of no more than 1/2 the power transformer’s VA
1/2 the maximum dissipation (in watts) of the output device. In the case of the IRFP240, it’s a 150W device, so no more than 75W. (Which is really, really hot…)
Six months in my F6 is still my favorite Pass amp.
I have an extra set of boards [A & B] I'd like to pass on.
If interested send me a message.
I would ask for $7.00 for shipping, payable to my PayPal account.
What a great amp.
I have an extra set of boards [A & B] I'd like to pass on.
If interested send me a message.
I would ask for $7.00 for shipping, payable to my PayPal account.
What a great amp.
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And thanks to 6L6 for the build guide and all the contributions that got me across the finish line.
My antek as-4218 is kinda driving me crazy. Anyone have a buzzing issue from the Torroidial? I have tried moving the rubber gaskets, loosening, tightning the mounting bolt but it emits a buzzing noise no matter what. Can this be solved electrically or is it mechanical? Tks
Wish I could help. I've got the same transformer in my yet to be completed f6. Where did you ground the transformer? I should be able to power up my amp sometime this week. I'll post results. I'll be following this
I have a 4218. No discernable noise to speak of. Mounted to a solid home made l bracket with the stock rubber washer that came with it. Have you checked to see how many amps it is pulling?
Even the slightest DC on your power service primary will make toroidal transformers buzz like mad. Try an isolation transformer to test this. Put your multimeter in DC mode and check the power socket. Even a couple of hundred milliamps can be a problem.
You should still try an isolation transformer between this and the wall outlet. Borrow one if you need to.
Or just 'knock-up" a dc trap - it's simple enough - be aware it is mains voltage though and the normal safety precautions apply - there's plenty of plans on this here diyA for a guide.
Mine buzzez slightly when I start it up but after that, it works fine. Have you confirmed the rectifiers are good to go? Hart to tell how the one on the left is hooked up but I assume it is correct.
How close do you have to be to hear the hum?
How close do you have to be to hear the hum?
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Does anyone know where I might find the pcb and mosfet mounting dimensions for the store DIY Audio F6 pcb's?
I've been using the Deluxe 5U so pre drilled/tapped but am now building mono blocks so need to get the heatsinks drilled and tapped.
I've been using the Deluxe 5U so pre drilled/tapped but am now building mono blocks so need to get the heatsinks drilled and tapped.
There is a PDF on this page with the dimensions: Universal Mounting Specification – diyAudio Store
Andy
Andy
Yes, thanks for that. I had seen it but the F6 isn't included. I'll sort it as it has same dimensions as the F4 pcb's I just noticed
I'll check tomorrow but likely the mosfets mount in same place as 2 of the F4 as well.
I'll check tomorrow but likely the mosfets mount in same place as 2 of the F4 as well.
The PCBs mount to the hole pattern on the heatsinks. Put that pattern on the heatsink and many different boards will fit, including F6.
Almost done
Hi All,
I wanted to share some pics of my F6 amp. I've been tinkering a bit with the bias/offset for the past couple of weeks, getting the bias up to ~.570mv while keeping the temps under 65C.
I have anti-vibration feet from diy audio store, which I'll install once I have long enough screws. Also, I have the speaker protection board ready to go but am waiting on more hook-up wire from DH Labs to arrive before I can install it.
I've assembled many PC's in my life but this is my first amp build. I learned a lot along the way and couldn't have done it without the community's help. Looking forward to enjoying this amp for years to come and am excited for the next build.
Thanks!
Hi All,
I wanted to share some pics of my F6 amp. I've been tinkering a bit with the bias/offset for the past couple of weeks, getting the bias up to ~.570mv while keeping the temps under 65C.
I have anti-vibration feet from diy audio store, which I'll install once I have long enough screws. Also, I have the speaker protection board ready to go but am waiting on more hook-up wire from DH Labs to arrive before I can install it.
I've assembled many PC's in my life but this is my first amp build. I learned a lot along the way and couldn't have done it without the community's help. Looking forward to enjoying this amp for years to come and am excited for the next build.
Thanks!
