An illustrated guide to building an F5

[Itsmee]

Most excellent 6L6

[Russellc]

Glad you posted this, the resistor that is parallel to the pot is confusing me. I have heard several who are using the Toshiba mosfets were having to modify the resistor, but I thought they lowered the resistor to 1.5 or so. Obviously, this is not the case in your build, clear enough.

What output mosfets did you use, and does anyone else have anything to add concerning modifying these resistors? My current build, (F-5 #2,) is using the Toshiba output mosfets. One fellow builder had his fire up fine with standard parts, others seem to have to modify....Any words from anyone on their resistor modification/alteration on their builds?

Russellc

[merlin2069er]

Ok, I've figured out what is happening. I must have been looking at the f5 service guide when I put together the PSU board. CViller's power supply boards labels are not in sync with that schematic.

So the correct value should be 2.2k ohm across the input of (T1 & T2) & (T3 + T4) and not .47kohms.

That's what has been popping my fuse. Silly me. I'll have to swap them around.

I've measured about ~15v dc & ~ 19v dc from the outputs of the bridges. Does that sound about right?

[tinitus]

I want to thank 6L6 for his great spirit and positive enthusiasm

[MEGA-amp]

Phenomenal!! Nice and clean, superb attention to detail...I mean completely fugly

[CanAm Man]

6L6.... Jim.... Clear, concise, succinct of your F5 build. Great pics, too. Hopefully, no one will hijack your thread! (Can you get it "locked up"?)

Originally Posted by merlin2069er

Ok, I've figured out what is happening. I must have been looking at the f5 service guide when I put together the PSU board. CViller's power supply boards labels are not in sync with that schematic.

So the correct value should be 2.2k ohm across the input of (T1 & T2) & (T3 + T4) and not .47kohms.

That's what has been popping my fuse. Silly me. I'll have to swap them around.

I've measured about ~15v dc & ~ 19v dc from the outputs of the bridges. Does that sound about right?

Ooohhhh, Merlin--congrats on being the first and quickest to hijack this fine thread. Perhaps you ought to consider posting your own thread, on your build and problems. And yeah....the 2.2k ohm resistor is a BLEEDER resistor (there for your safety). In any case, where did you find a requirement for .47kohm (470 ohm) resistors in the power supply? They are not part of the design.... (If you want to answer, best to do in a new thread, or one of your existing ones).

[6L6]

Originally Posted by CanAmMan

Hopefully, no one will hijack your thread! (Can you get it "locked up"?)

It doesn't matter. All the photos are in the top posts. What happens past that is gravy.

[ra7]

That was breathtaking! Excellent. Yup, whatever now is immaterial.

[samoloko]

question to users familiar with Hi-Fi 2000 boxes and Fischer Heatsink

are Hi-Fi 2000 using Fischer heatsinks - pics are like SK56 heatsinks

[stefanobilliani]

Congratulations !!! Very nice amp!