Simplistic NJFET RIAA

[vgeorge]

Yes, as I mentioned before the Falcon PSU outputs 110V, so I had a spare 230V to 2X60V 100VA transforemer in my stash and I used it as a step up transformer by reverse wiring it and secondaries in series.

 

[Salas]

So you need one 230VAC to 115VAC isolation transformer to power the generator/controller, then select 50Hz, then step up for a 230VAC/50HZ nominal AC synchronous motor. 4 pieces including the RoadRunner tacho/feedback loop. Did I get it right?

 

[vgeorge]

No, the wall wart can take 110 and 220V. Pyramid will set up the PSU for your player either for 60HZ or 50HZ, large or small pulley or you can do it yourself. For 220V you need a step up transformer at the output 110 to 220V only. 3 pieces for the full monty 220V

 

[Salas]

OK. No mains step down trafo but a universal wall wart provides the juice to the sinewave generator box then. Got it.

 

[robertor]

hello to all.
I'd like try to build this phono preamp for my Shure M75.
which scheme I can use?
might be fine the scheme of post # 154?
which scheme of PSU to use?
might be fine the scheme of post # 219?
thanks in advance and sorry for my terrible english.

 

[Salas]

Hi. Have you got 2SK170BL only on hand?

 

[stajo]

Are you building an atomic clock TT George? Love your gear

 

[robertor]

hi Salas!
I have 2SK170 on hand.
I might look for something else if necessary.

 

[Salas]

OK, I will fix an MM 40dB but also folded cascode with 170BL for robertor. But you will get 117GR too and you will make separate regulator for each channel like SSLV1.1. Alright? I will post your circuit in a little.

 

[robertor]

thank you Salas, very kind.

 

[Salas]

Is it a 5mV output 75 model? There were many.

 

[robertor]

i have the 75-6, 75B, 75E, 75ED.

 

[Salas]

OK 5mV-6.2mV then. 40dB gain will do.

 

[Salas]

Here you are. 8.5mA Idss K170BL centered. (Q2,R6 not there is no mistake, just not needed).

 

[vgeorge]

Are you building an atomic clock TT George? Love your gear

The accuracy of Pyramid' s controller is close!

The only problem I have now is that my Shelter 901 went south. I use a Denon 103 with a wood body I had for backup for the time. But there is another cart coming. Will let you know.

 

[Turbon]

Isn't it possible to change speed just by changing the freq?

Regards

 

[stajo]

I will needing your advices when my simple arrives so I wont mock you anymore. I dont know what rig to go for, but I think Im aiming for a dusty Technics SL-1710 that has alot of more service to go. I do like DDs. I had a look at it now and it has the original arm and a fairly fresh National Panasonic 700 II mounted. My plan is to oil it up and listen, then I have putted some 500 E away for a new MC. Any favvos?

 

[vgeorge]

Isn't it possible to change speed just by changing the freq?

Regards

You can change the speed by just pressing one button, which changes the frequency. Take a look at the manual.

 

[vgeorge]

I will needing your advices when my simple arrives so I wont mock you anymore. I dont know what rig to go for, but I think Im aiming for a dusty Technics SL-1710 that has alot of more service to go. I do like DDs. I had a look at it now and it has the original arm and a fairly fresh National Panasonic 700 II mounted. My plan is to oil it up and listen, then I have putted some 500 E away for a new MC. Any favvos?

For 500E have a look at Salas choice : AT-33PTG II
Can' t go wrong.

 

[stajo]

For 500E have a look at Salas choice : AT-33PTG II
Can' t go wrong.

Ok thanks. I can always hold him economically responsible if I dont like it.