Nice! Probably one of the better choices from Pass' stable in sunny ☀️ Singapore 😀
Best,
Anand.
Just a bit worried about the temperature. Out of the chassis, the heatsink is already hitting 55 degrees C. I may have to dial down the bias when I put it into the chassis. This is the Tropics!!!!
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"Don't Panic!" 😛
We have had some discussion recently and the thought was that an F6 sounds better at lower bias.
Thanks 🙂. I am already at the typical FirstWatt bias current. Will look into this again once i finish my power supply.
Is this with your heatsinks down on the table? If so stand them up with the mosfets on the lower half.
I have ordered f6 looking for schematic download and board pic download so I can order parts. 38 pages into this thread have not found anything I can print
At the first page there is a schematic you can print if you open the image in another tab. Right click the image.
Yes. headsinks down on table. Standing them upright will improve ventilation. Hopefully this will balance off the impact of a closed chassis.
Trythe zenner mod which I believe makes the amp more stable.
If creating an order consider using
LM329DZ. 6.9V As Zenners with
R7, R8 3k3 resistors.
Read through the build guide for the theory.
trying to buy parts. how important are the grades of q2(LSK170) q3(LSJ74) they are available in different grades A thru D LSK 170 at the DIY store has only grade A
You could parallel 2 of them but it is not something I would do. Too expensive. I checked the store and they show B grade for sale but not in a matched set. Easy to match yourself and you will have spares for another build.
Just finished up my first amp build (F6) ... absolutely thrilled with it! I followed 6L6 pretty much verbatim. I did use 6.8v for Z1/Z2 and switch R7/R8 3.3K as spelled out by ZenMod. Takes it better part of an hour, but bias is very stable at 510mV right now ... will probably leave it there for a while (maybe forever) as it sounds fantastic and is running around 51C.
As others are mentioning, finding the JFETs is quite a challenge at this time. Reading through other threads I saw alot of people have used Spencer Cheung (skcheung68@hotmail.com) for sourcing. He's asking about $46 (US) for two matched sets, so I figured I'd try it. They seems to be authentic pieces and are matched nicely ... plus the amp sounds great, so I'm happy.
Thanks to everyone for this thread (and forum), I couldn't have done it without you all. Think I'll try a Pearl 2 next and then maybe a F3 pre-amp ... I'm hooked!😀
As others are mentioning, finding the JFETs is quite a challenge at this time. Reading through other threads I saw alot of people have used Spencer Cheung (skcheung68@hotmail.com) for sourcing. He's asking about $46 (US) for two matched sets, so I figured I'd try it. They seems to be authentic pieces and are matched nicely ... plus the amp sounds great, so I'm happy.
Thanks to everyone for this thread (and forum), I couldn't have done it without you all. Think I'll try a Pearl 2 next and then maybe a F3 pre-amp ... I'm hooked!😀
