I'm paying attention to the proper clearances for high voltage, and there are ground pins between them. I'm going off of acceptable clearances for higher voltage as defined by IPC2221, 0.8mm is sufficient for up to 500 volts, which is far more than this board is likely to ever see. Maybe I'll crank it up to 1mm just to appease any nervous folk?
I plan to order a set of five of each and I'll build one of each, and send out the others to other users for testing if they look good to go.
EL84 triode will have slightly more distortion, but a higher mu- about 20 with a bypassed cathode. It should also get slightly lower output impedance due to the higher gm. Noise I can't say.
I plan to order a set of five of each and I'll build one of each, and send out the others to other users for testing if they look good to go.
EL84 triode will have slightly more distortion, but a higher mu- about 20 with a bypassed cathode. It should also get slightly lower output impedance due to the higher gm. Noise I can't say.
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I just gave everything a once-over final look, and ordered 10 noval and 10 octal boards in swooky blue 
Hopefully I have them within a week! I went with DHL express shipping which in past instances has been very quick, although it's been a year and a half since I did a PCB order so who knows how it will be affected by the current state of the world
I'll probably build up one of each myself, and then send the others out to others. Anybody have a pair of 6AQ5 to donate to the cause? I have a couple seven pin sockets already
I think I'll start a new thread once they arrive to keep the development and further discussion of the PCB from cluttering up this thread. Then we will do the 6P1P variant as well, and any other changes can be discussed. There will also be a power supply PCB to develop as well.
Hopefully I have them within a week! I went with DHL express shipping which in past instances has been very quick, although it's been a year and a half since I did a PCB order so who knows how it will be affected by the current state of the world
I'll probably build up one of each myself, and then send the others out to others. Anybody have a pair of 6AQ5 to donate to the cause? I have a couple seven pin sockets already
I think I'll start a new thread once they arrive to keep the development and further discussion of the PCB from cluttering up this thread. Then we will do the 6P1P variant as well, and any other changes can be discussed. There will also be a power supply PCB to develop as well.
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Shipped! Should be here Thursday!
Me too. But I'd prefer to pay full price for one rather than get a discount price to evaluate it for you. I tend to be slow to build projects as I have lots of irons in the fire. I wouldn't want you to depend on me to evaluate it in a timely manor.
Shipped! Should be here Thursday!
Great! I think I have all parts ready
Salas: I hope you do not mind us discussing this in this thread?
I am interested in a noval 9 pin board to try out the EL84s. I am willing to pay for a full price to help to upset part of your cost because I tend to too slow on all my projects and don't want to holding your progress.
The 6V6 preamp that I brought to the 2019 BAF took several months to finish before the week of the venue start. Kind of rush to put things together built.
The 6V6 preamp that I brought to the 2019 BAF took several months to finish before the week of the venue start. Kind of rush to put things together built.
Salas as now I am gonna use all your designs for the psu here may as well do all things right:
Will single L-adapter be able to power both tubes?
Using tube rectifier and your HV2 regulator what PT secondary voltage would be the best for this project?
Single L-Adapter is capable of powering two 6V6 heaters no doubt. I had used a 310 0 310 VAC 200mA secondary transformer in the original for supporting various rectifier tubes. With first smooting capacitor sizing and RC smoothing cell sizing a 300 0 300 VAC Tx could also do the job. You have to always read the datasheet of a rectifier tube type to see about max allowed first capacitor value, voltage loss curves, etc. The SSHV2 itself will do alright with 10V-20V DC drop across it. You take that into account too.
