Could two of those be a candidate for BAL Pre parallel JFETs?
https://www.ebay.com/itm/253516984831?hash=item3b06ca31ff:g:gGUAAOSw2fdamYG4
https://www.ebay.com/itm/253516984831?hash=item3b06ca31ff:g:gGUAAOSw2fdamYG4
I brought a matched octet from him a few weeks ago they seem to be the real deal. Did not know you can use them with the Iron pre.
Yes, Iron Pre is made for those JEFTs.
I ordered two of these octets and asked to get two with Idss close to each other.
Then I will try out the parallel configuration for IP BAL.
I may do the piggy-backing if this seems to be the easiest way to implement it.
I ordered two of these octets and asked to get two with Idss close to each other.
Then I will try out the parallel configuration for IP BAL.
I may do the piggy-backing if this seems to be the easiest way to implement it.
Getting the Idss close to each other between octets (channels) is unnecessary, but it cannot hurt anything.
The matching advertised within octets is exceptional (IMO).
Looking forward to your thoughts. Fun stuff.
The matching advertised within octets is exceptional (IMO).
Looking forward to your thoughts. Fun stuff.
Pa said several times that punkydawgs is real deal, he knows the man
yes, of course
but, be sure that you get proper balanced one, both coils on same core
if not, just don't bother
but, be sure that you get proper balanced one, both coils on same core
if not, just don't bother
I got response from "Punky" that they will find two octets with Idss as close as possible (just nice to have 100% symmetry to get even better sleep at night).
I assume that I can test the PSU for function before I install the parallel JFETs. Just to be sure not to damage them. We will see.......I have built the SE version so I know which errors not to make next time 🙂
Now when I get very close matched JFETs it is tempting (after I got at hint) to measure DC-offset to check if 20R pot is needed or not. It would give even better "drive" of the Cinemags. We will see how "brave" I am when it comes to the "execution". If DC offset is less than 10 mV (or so).....I think I go for it.
I assume that I can test the PSU for function before I install the parallel JFETs. Just to be sure not to damage them. We will see.......I have built the SE version so I know which errors not to make next time 🙂
Now when I get very close matched JFETs it is tempting (after I got at hint) to measure DC-offset to check if 20R pot is needed or not. It would give even better "drive" of the Cinemags. We will see how "brave" I am when it comes to the "execution". If DC offset is less than 10 mV (or so).....I think I go for it.
I got an email asking, since I was a very nice customer of the store, if I had any interest in an Iron Pre Essentials kit. The credit card made a brief appearance. Long enough for information to be exchanged in a secure manner.
Well geez, I ordered the kit last night. Just what I need, another amazing project😉 So really who the hell could resist this? I looked at it when the interest list was being made, and I says to myself, "Maybe you should show interest here". The main attraction to me was the use of the Cinemag transformers. This something that I have had no experience with in the past and have often wondered what the sound would be like. I got some other projects to get out of the way, but then the serious contemplation of things like layout, chassis choice, and a bunch of seemingly simple stuff has to be approached first.
I am trying not to act like a kid before Christmas morning.
I am trying not to act like a kid before Christmas morning.
Well you know, all the hyperventilating and stuff.... Before I was old enough to figure it out, I would start thinking about the holidays in Sept! Made the wait too much.