In spite of some other things commanding my time, I’ve finally managed to get started on the wiring for the new amplifier.
This last week I’ve been working on getting a new media server up and running on my home network. Between some simple Linux issues and navigating a server software package I’ve never used before, the task has eaten up a lot of my free time. But I finally carved out a couple of hours to get started on the amplifier wiring.
It many not look like much but this is real progress. The signal ground bus is all installed. This one is a little more complicated than most but after trying several layouts I think this one is a reasonable option. I managed to get the power transformer fully wired along with the filament wiring for the 6.3V tubes. The first discrete components are also installed; two resistors for the filament circuit virtual ground and the power supply 33µf reservoir capacitor is installed.
Next steps will be getting the output transformers primaries wired and the separate LC filters for each power stage in place. I should get to this in the next few days. Overall I’m happy with how this amplifier is progressing.
As always, questions and comments are welcome.
Hi Matt,
Layout looks very nice.
Is it too much for using pot for exact balancing the heater resistors?
Also would you please advise if there is any hum/hiss level difference between connecting star ground to the negative of first cap or last cap.
Using a potentiometer in place of the two 100Ω resistors is not required with these tubes. The only time to do that is if you are using directly heated filamentary cathode tubes. The position of the star ground shouldn’t matter. So long as you have no ground loops you should be fine.
Looks Good, I am interested to seeing how the chokes will get wired into the LC filter.
Actually, like this:
The main choke just gets wired in in series with the dropping resistor down by the rectifier socket.