Thanks
but that doesn't really help with my limited Electro understandings. A childs' level answer..bitte.
................I thought the F6 transformers serve as Buffers ??
If so? is there any purpose in using a B1 ?...............
..........Thanks
output devices in F6 are working in counter-phase , so they must be modulated in same manner;
transformer is doing exactly that - input SE signal is transformed at secondaries in two SE signals, opposite in phases
to drive xformer properly - there is need for buffer in front of it - that's exactly pair of these two JFets in input, pretty much same in construction as B1 R.2
would you use B1 in front of F6 - yeah, you bet - every $$hitty volume pot is singing better when having decent buffer following it , and that's exactly what B1 is - volume pot enormously helped by buffer connected after
is this simple enough ?
Yess Thank you ! ..
Now your first answer is perfectly clear/understandable .
A good answer.. IF one was knowing this info to begin with.
Have a shitty Dact gizmo now (only) in front of My F6 and it works V well !
(acclimatized to crappy gear over the preceding decades I suppose).
Will happily build/fit one then. Is there currently anything even better ?
As small defence: I Asked a couple of Years back about fitting a B1..
but forum answers said: that the F6 had inbuilt buffer and a B1 wasn't Needed.
Clearly ..Not All forum answers are as good as their Posters think
Now your first answer is perfectly clear/understandable .
A good answer.. IF one was knowing this info to begin with.
Have a shitty Dact gizmo now (only) in front of My F6 and it works V well !
(acclimatized to crappy gear over the preceding decades I suppose).
Will happily build/fit one then. Is there currently anything even better ?
As small defence: I Asked a couple of Years back about fitting a B1..
but forum answers said: that the F6 had inbuilt buffer and a B1 wasn't Needed.
Clearly ..Not All forum answers are as good as their Posters think
So I thought I was doing well! I’ve got the amp up and running. No smoke, pops whistles or anything. Bias and offset more or less spot on 500mv both sides. But the left channel is considerably quieter then the right! Centre voices are not all the way in the right speaker but two thirds there.
I’ve swapped interconnects and it stayed with the left speaker.. Any ideas please guys?
Thank you
I’ve swapped interconnects and it stayed with the left speaker.. Any ideas please guys?
Thank you
I have had issues with those ten turn pots in the past. I order fresh new ones from mouser or digikey. I also exercise the before I install them. You are not the only person that has had problems with those pots.
They look good to me. The pot is rock solid, no discernible movement. I’ll check again tomorrow and see if it happens again.
Thank you
That’s good to know in one way. I’ll keep an eye on it over the next couple of days.
Thanks for the reply.
Ok, so I’ve just turned the amp on this morning from cold and the imbalance has returned! Left channel output much quieter. Swapping interconnects doesn’t alter anything. Is this something to do with heat then? As it warms up, could it alter a component? I’ve ordered another 5k pot, could it be that? Looks like I’ll have to take the board out doesn’t it?
Would anyone suggest specifically what to check for please? I’m a first time builder, so direction would be much appreciated. When it worked though last night, it sounded great. I’m really impressed.
Thank you
Would anyone suggest specifically what to check for please? I’m a first time builder, so direction would be much appreciated. When it worked though last night, it sounded great. I’m really impressed.
Thank you
either bad solder point or faulty trimpot
you'll know when you replace it
in a meantime, don't think too much, do something else
That’s a good point. I tend to be consumed, as my wife is well aware!
I’ll leave it until Tuesday, replace the pot first and see what happens. I’m assuming a bad pot could do what I’ve described?
Thanks Zen Mod
Sorry, couldn’t resist, told you I was consumed. This is a photo of the pins of the capacitor nearest the offset pot. One of the solder joints is pretty bad.. this was the first ever pcb I’ve populated (in my poor defence!). Is this the likely source do you think, anyone?
Please, no abuse over my soldering..
thank you
Please, no abuse over my soldering..
thank you
