If anybody actually wants to buy from GD Parts, you'll get better pricing on their actual website.
Wholesale Buy Various Tube Guitar Amp DIY Repair Parts from mafaudio Vintage HIFI DIY
Wholesale Buy Various Tube Guitar Amp DIY Repair Parts from mafaudio Vintage HIFI DIY
Sorry if I misunderstood this, but in reading Allen wrights cookbook, he says the best dielectric is air, the next best or there about s is Teflon.
That then tells me you want the socket to be made of the highest resistance as possible, just throwing numbers for an example. If Teflon has 100G of resistance, and the pcb has 10G . That now means you just put that in parallel with the Teflon, and you now only have 9G of resistance between the pins. May as well use standard construction sockets if using pcb.
Awesome.
Electrically there is a relationship between dielectric permittivity and impedance.
Mechanically there is also a difference.
Reality; its your build, choose the lesser of all evils and bias it accordingly.
Kindest,
Jacob
Electrically there is a relationship between dielectric permittivity and impedance.
Mechanically there is also a difference.
Reality; its your build, choose the lesser of all evils and bias it accordingly.
Kindest,
Jacob
Last edited:
Vacuum is much better than air. Teflon is probably the best commercially available dielectric material. It`s not just a matter of resistance.
Is it really an issue at AF? RF I can see, but at AF surely those capacitances are small enough as to be ignored?
I view them as an unnecessary luxury item. Nice, but not needed. I wouldn't want to hide them by plugging mundane tubes into them.
I recall some British amp, I think it was, that did just that. It soldered baseless output tubes to a PCB and the amp had to be sent in for repair when a tube wore out. Nice way to insure a steady income stream, I 'spoze.
I wonder what sort of warranty period they could afford to give on those.
For DIY amplifiers and DHTs getting changed out only at the end of their serviceable life, soldering direct to four pins makes sense to me, octals.. not so much.
For DIY amplifiers and DHTs getting changed out only at the end of their serviceable life, soldering direct to four pins makes sense to me, octals.. not so much.
Last edited:
Electrically speaking, PTFE and Ceramic are nearly the same. However the advantage of either socket is immediately lost by mounting them on a circuit board.
Ian
Last edited:
Don't forget the valve/tube base too. Older NOS octal type typically have black or brown Bakelite bases. These have lots of carbon in them. 🙂
So there is probably not much advantage using an expensive PTFE socket for octal connections. Far less costly ceramic would be just fine too so long as the pin contacts are decent. Phenolic probably won't sound (or scope) any different.
I would look for ones with the robust pin connections. That is going to be far more important if you tend to remove/replace valves/tubes.
Ian
Last edited: