F6 Amplifier

[jacco vermeulen]

Originally Posted by Zen Mod

do you mind ?

Eer, you an Abacom file collector or actually planning to assemble a Fierst Waff ?

(me no have upsidedown reader with spell check)

[Ryssen]

F6 Amplifier

How do you trimm the 10 ohms pot?
Could a panelpot be used for them?

[Zen Mod]

Originally Posted by permaneder

Of course. Send a PM and I'll mail the file plus the Gerber files

Vielen Dank - files received

Originally Posted by jacco vermeulen

Eer, you an Abacom file collector or actually planning to assemble a Fierst Waff ?

(me no have upsidedown reader with spell check)

just handy to have them , from few reasons - neat and simple layout , I have Sprint proggie

will not going to make it ; my heart is still with M2 , as most wakoo Papa's prank

[6L6]

Are any of these PCB being sized to fit the Universal Mounting Spec?

http://www.diyaudio.com/forums/image...ation-v2.1.pdf

[Antoinel]

Originally Posted by lhquam

After seeing Tea-Bag's PCB layout, I was inspired to play around with another layout variation. This one is Jensen only and provides some additional options, such as lowered voltages to the drains of the input JFETs.

lhquam: The center to center spacing between the drains of the R100s in your PCB is estimated at ~3.7 inches. By comparison, the distance in proto F6 by Mr. Pass appears to be ~ twice this value. The junction temperature in the R100s of your design is expected to be relatively higher than that with more physical separation between the R100s. Is hotter better or worser for sound, for the ratio of H2 to H3 etc.?

There is an element of symmetry in the PCBs proposed by you, permaneder and Tea-Bag on either side of a line between the R100s. They are also highly compact. The probability is very low that we will ever learn about anything on the inside of a production F6. Possibly, with the permission of Mr. Pass, one may be able to reproduce a PCB like the one in his proto F6 and compete with the others. Mr. Pass: will this be OK with you?

[KBK]

Originally Posted by lhquam

Heat dissipation is not an issue for such a low resistance. The idle power will be Ibias^2*R. For Ibias=1.5A, and R<0R44, the power will be less than 1 watt.

Which means you can move to 3 watt surface mount foil.

http://www.digikey.ca/product-detail...8CT-ND/1936102

At about $1.5 $2 each, it's no contest. Foil wins, the others do not even need to get out of bed. They should just stay there.... and fade away.

[lhquam]

My PCB layout is for 5"x7" fan cooled heatsinks like shown here:F6 Amplifier.

Originally Posted by Antoinel

lhquam: The center to center spacing between the drains of the R100s in your PCB is estimated at ~3.7 inches. By comparison, the distance in proto F6 by Mr. Pass appears to be ~ twice this value. The junction temperature in the R100s of your design is expected to be relatively higher than that with more physical separation between the R100s. Is hotter better or worser for sound, for the ratio of H2 to H3 etc.?

There is an element of symmetry in the PCBs proposed by you, permaneder and Tea-Bag on either side of a line between the R100s. They are also highly compact. The probability is very low that we will ever learn about anything on the inside of a production F6. Possibly, with the permission of Mr. Pass, one may be able to reproduce a PCB like the one in his proto F6 and compete with the others. Mr. Pass: will this be OK with you?

[Antoinel]

Originally Posted by lhquam

My PCB layout is for 5"x7" fan cooled heatsinks like shown here:F6 Amplifier.

Thanks lhquam.

[Tea-Bag]

Originally Posted by 6L6

Are any of these PCB being sized to fit the Universal Mounting Spec?

http://www.diyaudio.com/forums/image...ation-v2.1.pdf

Yes, @ 120mm from screw hole of power Fets.

[Zen Mod]

Originally Posted by KBK

Which means you can move to 3 watt surface mount foil.

KRL7638-C-R018-F-T1 Susumu | KRL76C.018CT-ND | DigiKey

At about $1.5 $2 each, it's no contest. Foil wins, the others do not even need to get out of bed. They should just stay there.... and fade away.

taking in account importance of value precision and/or tolerance - plain vanilla Panasonics are more than OK

but I agree - those KRL are sexy looking

( see - ZM as resistor fetishist ; I'm becoming same as Jaccolina )