I'm in the process of building the balanced zen preamp. I built the BOZ preamp a few years ago and love it!!! With the new preamp I would greatly appreciate any suggestions on a buffer circuit to add tape loop/processor capabilities.
Thanks!!!!
Tom
trq10180@flash.net
tquinn@redback.com
Thanks!!!!
Tom
trq10180@flash.net
tquinn@redback.com
Tom,
How about a simple current sourced mosfet buffer. Idleing the mosfet at about 10ma. should be enough. Input impedence should be very high and a bias of 10ma. should be high enough to drive the input of most tape decks.
Jam
P.S. Comments, Grey?
How about a simple current sourced mosfet buffer. Idleing the mosfet at about 10ma. should be enough. Input impedence should be very high and a bias of 10ma. should be high enough to drive the input of most tape decks.
Jam
P.S. Comments, Grey?
Slightly off the subject, but can I ask: Where do you find those higher- Idss parts in the US? I have looked while preparing to build a Pearl, and can only find the parts at Consolidated Electronics and MCM so far; and those are apparently the -GR (low) ones. Do you know where can I find the -BL or -V parts without going to Europe or Asia?
There was a previous thread that contained this discussion, but all sources mentioned were overseas relative to the US.
Thanks-
There was a previous thread that contained this discussion, but all sources mentioned were overseas relative to the US.
Thanks-
source for BL JFETs - good question; no idea!
I'd like to know myself. I've only been able to find the GR in the US. I was actually looking for some V, the highest Idss group. Toshiba hasn't been willing to give me samples 🙁
I have a few 2SK170BL and 2SJ74BL that I got from an old (but REALLY good - before the transport irreparably died) casette deck.
Michael
I'd like to know myself. I've only been able to find the GR in the US. I was actually looking for some V, the highest Idss group. Toshiba hasn't been willing to give me samples 🙁
I have a few 2SK170BL and 2SJ74BL that I got from an old (but REALLY good - before the transport irreparably died) casette deck.
Michael
If you're looking for GR, you've found him...I'm right here.
I would like to hear of a good source for those devices, as it seems that the majority of the places selling them keeping popping up in Counterfeit? discussions. I would like to buy with a bit more confidence.
Jam,
I'd say 10mA should do an admirable job. Actually, you could probably get by with less, but it never hurts to have more drive than you need. The converse, however, is a bummer.
Grey
I would like to hear of a good source for those devices, as it seems that the majority of the places selling them keeping popping up in Counterfeit? discussions. I would like to buy with a bit more confidence.
Jam,
I'd say 10mA should do an admirable job. Actually, you could probably get by with less, but it never hurts to have more drive than you need. The converse, however, is a bummer.
Grey
Everyone, check out
http://www.borbelyaudio.com/
Pricing information -> components
I think it is also much safer to order from Mr. Borbely even if it's a bit more expensive. He uses these transistors in his own projects so they should be the "real" ones : )
Ergo
http://www.borbelyaudio.com/
Pricing information -> components
I think it is also much safer to order from Mr. Borbely even if it's a bit more expensive. He uses these transistors in his own projects so they should be the "real" ones : )
Ergo
2SK369BL at Consolidated
I got a few pcs. of 2SK369BL (*BL*, not *GR*)from Consolidated just a few days ago, so they might still have them.
Andrej Deticek🙂
I got a few pcs. of 2SK369BL (*BL*, not *GR*)from Consolidated just a few days ago, so they might still have them.
Andrej Deticek🙂
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