The diyAudio Firstwatt F6

[6L6]

Ok, I've got beta testers! PKI, Buzz, and Marra. (and myself)

Thank You!!

 

[Marra]

Thanks Jim I look forward to receiving the boards. I will have to strip out the F4 pcb's and reuse the chassis and power supply.

 

[6L6]

That will work famously. Thanks!

 

[Marra]

How quickly do Jensen usually reply to emails?

 

[Dennis Hui]

How quickly do Jensen usually reply to emails?

I've had a couple email communications with Jensen and they were
not that quick. After perhaps 4 days I sent a followup and did receive
a detailed response. Later on I tried clarifying a point about drop
shipping multiple packages and that went unanswered.

Apparently calling is the preferred route.

Cheers,
Dennis

 

[WalterW]

Ok, I've got beta testers! PKI, Buzz, and Marra. (and myself)

Thank You!!

Do you have enough betatesters Jim?
I have all the components in the drawer...also the Jensen 😀

Walter

 

[buzzforb]

MArra,
I may have a couple extras lying around if you have issue.

 

[Audio Zen]

The far transistor needs to be over the centerline of the 5U case's heatsink - it is a two-peice extrusion, and this way each Mosfet will be on it's own heatsink.

The 4U is a single extrusion, so it being off-center means little.

A bit closer to the transformer is not a bad idea however... 🙂

Jim, I am thinking about getting another chassis but thinking something that will work with more projects here and possibly going F6, would you suggest the Deluxe 5U?

 

[Zen Mod]

I'm having experience with both 5U/400 and 5U/500 cases ; bigger is certainly better

no problem being two-per-side

 

[Marra]

MArra,
I may have a couple extras lying around if you have issue.

Thanks Buzz pm sent.

 

[6L6]

Jim, I am thinking about getting another chassis but thinking something that will work with more projects here and possibly going F6, would you suggest the Deluxe 5U?

There is no doubt that bigger is more flexible, more room inside, more heat rejection, etc... of course this comes at the cost of being, well, bigger. I always suggest to people this; make a quick mock-up of the chassis out of cardboard and see if it's as big as you think. If it's ok, wonderful! (And remember, Papa said "There is no such thing as too much heatsink!")

The 4U is still plenty enough chassis for F5, F5C, F4, AJ, F6, Honey Badger, and 6-deep Burning Amps. You only really need the 5U for F5T and Burning Amps with a second set of output transistors.

 

[PKI]

Just for the record AJ runs hot in 4U 🙂

 

[6L6]

Just for the record AJ runs hot in 4U 🙂

Yes, it's right on the edge. Turning down the bias a bit helps.

Ooh -- look what showed up in the post today... 🙂

Beta testers, I'll get them sent off today.

 

[Marra]

Good one. Hopefully the boards and transformers from buzzforb will arrive at the same time. I should be able to start soldering in 10/14 days time.

 

[Maousse]

Time to start drilling heatsink's holes for my stock 4U 🙂

 

[chatziva]

slurp! yum!

 

[PKI]

Jim, will RN60 8.74mm case length resistors fit the boards?

 

[didiet78]

I thing it will fit. I use 12 mm spacing for resistor.

 

[PKI]

Thanks!

 

[PKI]

ugh, these 0R56 resistors are fought to find! even 3||0.68 is a problem :-(