John Curl's Blowtorch preamplifier part II

Status
Not open for further replies.
Jump to Latest
#92,382
Demian, looks more like this is what I have to do.... Compared to usb stick... it is livable size. And, if I increase the C's, I can keep or reduce the L's. Polystyrene values don't go high in value, so large L would be needed. But I have a tonne of REL caps of all types.... so cost isn't an issue for large values. Next.... making/buying the L's.

I wonder if I could buy a CLT-1 and just change the C's to get what I want??



THx-Richard
 
Last edited:
#92,388
RNMarsh said:
Demian, looks more like this is what I have to do.... Compared to usb stick... it is livable size. And, if I increase the C's, I can keep or reduce the L's. Polystyrene values don't go high in value, so large L would be needed. But I have a tonne of REL caps of all types.... so cost isn't an issue for large values. Next.... making/buying the L's.

I wonder if I could buy a CLT-1 and just change the C's to get what I want??



THx-Richard
Click to expand...

If you can even find a CLT-1. You need 2 to measure thru performance. One is only good for passive nonlinearity. The inductors are on Ferrite cores. Retuning it to 1 KHz probably won't work, too many issues. Its time to design inductors that will be distortion free at lower frequencies and usable currents. It must be possible. I would start with a Mumetal core and run it at very low flux. Or manye you have access to super conductors? If the frequency is above 1 KHz Litz wire would be important and will special winding techniques to minimize capacitance etc. . .
 
#92,390
Waly said:
Standard operating procedure. Understanding how these things are working is for wussies. Noise, noise gain, same thing, who cares, anyway?
Click to expand...

So no one knows how to do it except for passive means. OK. Thanks. No, I don't pay any attention unless it pertains to my narrow focus. Other wise its too much talk with zero out come towards my main focus. why even entertain anyone in discussing true noise gain ?? Now, if one said they had an idea to try which might work.... I'll entertain that with you. Ultra high feedback, dual opamps, might work in filter circuit but I haven't seen one good enough.... show me.


THx-RNMarsh
 
#92,391
1audio said:
If you can even find a CLT-1. You need 2 to measure thru performance. One is only good for passive nonlinearity. The inductors are on Ferrite cores. Retuning it to 1 KHz probably won't work, too many issues. Its time to design inductors that will be distortion free at lower frequencies and usable currents. It must be possible. I would start with a Mumetal core and run it at very low flux. Or manye you have access to super conductors? If the frequency is above 1 KHz Litz wire would be important and will special winding techniques to minimize capacitance etc. . .
Click to expand...

Seems one will do it.... I am filtering a signal generator.... unbal output. Low voltage and current.

Let me know if you see one for sale (CLT-1). meanwhile I'll be reading best way to wind high L values and keep high Q also. There are some excellent cores out of Germany.



THx-Richard
 
Last edited:
#92,396
Thanks guys for responding to my call. Unfortunately, only the 'heavy hitters' mostly an inconvenient distance away, have responded, and I hope to hear from less experienced, but equally enthusiastic people who want to build something audio, but don't have the resources or experience to really do it easily.
 
#92,397
JC...

That is a very good offer and it is sad that few suitable candidates have contacted you so far.

I would suggest that you start a new thread - simply because this thread has become a pretty closed shop and seldom has much of interest to the type of candidates you require.
 
Status
Not open for further replies.
Top Bottom