I guess the title says it all, I'm biasing the f5 and the metal from the DMM shorted over to the screw of the standoff, nice firework display;(
These are diy audio boards and it was from the resistor that sits over the N FET (R12)
These boards have no current limiting doohickey, as per the preference of Peter Danials I am led to believe. They were knocked up by a friend and sat in my draw for a year before I replaced the PD boards I had in previously.
The DMM is still reading voltage across all resistors.
Any ideas about possible consequences and what I will need to replace if sweet music is not forthcoming?
Many thanks in advance
These are diy audio boards and it was from the resistor that sits over the N FET (R12)
These boards have no current limiting doohickey, as per the preference of Peter Danials I am led to believe. They were knocked up by a friend and sat in my draw for a year before I replaced the PD boards I had in previously.
The DMM is still reading voltage across all resistors.
Any ideas about possible consequences and what I will need to replace if sweet music is not forthcoming?
Many thanks in advance
I had a bias thermistor lead short to ground…not the same thing but kind of the same thing.
Took out P2. In my case, it wouldn't bias up after. Hard to bias without a working trimpot.
Took out P2. In my case, it wouldn't bias up after. Hard to bias without a working trimpot.
Well the trim pot is still working, that's some good news. The rubber insulation around the crocodile clips was getting a bit loose in the heat. One millisecond of distraction, one nervous guy.
Ho hum
Thanks for the reply
Ho hum
Thanks for the reply
Señor 6L6 - I was so close to making the Aleph J to put in this box, to replace the PD F5 boards, but opted to try another F5 as I had a set made up.
Something was missing from my set up, just couldn't put my finger on it, so was set to try another amp. With hindsight it may just have been the poor solder I was unwittingly using for the pd boards.
Long story short - what's your feelings about these two amps? I may well make the AJ anyway as I have premonitions about bi amping some small FR over an H frame bass Set up.
Something was missing from my set up, just couldn't put my finger on it, so was set to try another amp. With hindsight it may just have been the poor solder I was unwittingly using for the pd boards.
Long story short - what's your feelings about these two amps? I may well make the AJ anyway as I have premonitions about bi amping some small FR over an H frame bass Set up.
Yes, the photo posted - it looks wonderful!
As for the two amps I always say comparing Firstwatt designs is akin to having a garage full of Ferraris, and trying to decide which one is the most Italian Sports Car - that are all awesome and fantastic and wonderful in their own way.
The best description between the sound of an F5 and of the Aleph J is something Zen Mod said -
With the F5, you will be able to hear the cockroach crawling around the Violinist's feet, which the Aleph J, the Cockroach will smile at you.
BUT the other thing to consider is that with little modification the AJ board will fit in that box, and the PSU is identical. Nothing holding you back from trying both. 🙂
As for the two amps I always say comparing Firstwatt designs is akin to having a garage full of Ferraris, and trying to decide which one is the most Italian Sports Car - that are all awesome and fantastic and wonderful in their own way.
The best description between the sound of an F5 and of the Aleph J is something Zen Mod said -
With the F5, you will be able to hear the cockroach crawling around the Violinist's feet, which the Aleph J, the Cockroach will smile at you.
BUT the other thing to consider is that with little modification the AJ board will fit in that box, and the PSU is identical. Nothing holding you back from trying both. 🙂
That's a nice look with the wood front panel, also it won't heat up from being in contact with the heat sinks. I may try this concept for my "Vanilla" amp when I finally get it running (perhaps this weekend). I'll start out with FR-4 panels, but will maybe switch to wood once things have been running for a while.
The front panel is an olive wood chopping board. It sits on a plate of aluminum, held away from an identical plate (screwed to the heat sinks) by 5mm spacers.
Top and bottom plates also sit off the heat sinks via 5mm spacers, no need for mesh and it runs on the cool side for its spec.
The volume control will become a power switch when I finish the "Juma" preamp.
Have to say, now I've got fully functioning boards, my jaw is on the floor at how awesome this amp actually is.As tempting as it is to wax lyrical, I know I will be preaching to the converted!
Hallelujah
Top and bottom plates also sit off the heat sinks via 5mm spacers, no need for mesh and it runs on the cool side for its spec.
The volume control will become a power switch when I finish the "Juma" preamp.
Have to say, now I've got fully functioning boards, my jaw is on the floor at how awesome this amp actually is.As tempting as it is to wax lyrical, I know I will be preaching to the converted!
Hallelujah
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