Not sure that the kit comes with pot…lol…gotta buy your own
No free pets/critters that’s for sure…you need to make arrangements with ZM if you want to adopt 😉
Edit: IAIMH beat me…there’s you answer
No free pets/critters that’s for sure…you need to make arrangements with ZM if you want to adopt 😉
Edit: IAIMH beat me…there’s you answer
just a note, I've seen ystrdy that (recommended by me) Slagle "200$ AVC set" is now 300$
(wrote before, don't want to clutter this thread with Iron Pumpkin - I will not sell my Iron Turtle AVC separately; as it happened, I did show enormous talent to ubercomplicate my own life with zillion of different amps ..... no need to do it with everything)
(wrote before, don't want to clutter this thread with Iron Pumpkin - I will not sell my Iron Turtle AVC separately; as it happened, I did show enormous talent to ubercomplicate my own life with zillion of different amps ..... no need to do it with everything)
So, a unit like this could be used as "vol pot" for the Iron Pre?
https://www.bartola.co.uk/valves/tag/dave-slagles-avc/
Double iron?
https://www.bartola.co.uk/valves/tag/dave-slagles-avc/
Double iron?
nope; explained plenty of times, but so again 
short standard attenuator pads, wire (any) AVC in place/instead of (Cinemag, Edcor, Jensen) output autoformer, Voila!; best to use approved** AVC if you want to have possible gain (appropriate wiring of signal to AVC); some are having complicated switching of signal tap and output and those are difficult or impossible to wire for resulting gain
**for now, I know that Slagle 200..... ups! 300$ is adequate; other from same source having two switches are not
so - if in doubt for any , ask here or in future thread
short standard attenuator pads, wire (any) AVC in place/instead of (Cinemag, Edcor, Jensen) output autoformer, Voila!; best to use approved** AVC if you want to have possible gain (appropriate wiring of signal to AVC); some are having complicated switching of signal tap and output and those are difficult or impossible to wire for resulting gain
**for now, I know that Slagle 200..... ups! 300$ is adequate; other from same source having two switches are not
so - if in doubt for any , ask here or in future thread
Ok, it makes sense that AVC is the output of a preamp.
I build the Iron Pre "as is" with Cinemag. The output impedance depends on gain settings. It is not as simple as standard preamps where in many cases it is just a 50 ohm resistor.
I build the Iron Pre "as is" with Cinemag. The output impedance depends on gain settings. It is not as simple as standard preamps where in many cases it is just a 50 ohm resistor.
Iron Pre SE is having settable gain +6db or +12db; that's 2V/V and 4V/V; in first case Rout is 2^2*Rout of JFet buffer, in second case it is 4^2*Rout of JFet buffer
Iron Pre Bal is having strictly just +6db of gain, which is 2V/V; Rout is 2^2*Rout of JFet buffer, per phase; or 2*(2^2*Rout of JFet buffer) sum/balanced
Rout of complementary JFet buffer is Rout of Nchannel side in parallel with Rout of Pchannel side
that being (1/xconductance + Rsource) of upper, in paralell with (1/xconductance + Rsource) of lower
Rsource roughly 1/2 of common trimpot in sources ; 10R to 20R trimpot
xconductance of tiny TO92 Toshiba critters is (taken midrangey) 15mS ......... you can see it as ~65R resistor (1/S)
so, 65R + 10R up, 65R + 10R down, means 75R up and 75R down, means 37R5
easypeasy
dunno what's standard preamp, but everyone who heard this one agree that it isn't standard
regarding preamp Rout - I don't care for it - as long it is low enough
now ....... just imagine what happens with Rout when you have AVC in place of fixed autoformer ..... set with no gain and say that you took signal to output from -6db tap?
Iron Pre Bal is having strictly just +6db of gain, which is 2V/V; Rout is 2^2*Rout of JFet buffer, per phase; or 2*(2^2*Rout of JFet buffer) sum/balanced
Rout of complementary JFet buffer is Rout of Nchannel side in parallel with Rout of Pchannel side
that being (1/xconductance + Rsource) of upper, in paralell with (1/xconductance + Rsource) of lower
Rsource roughly 1/2 of common trimpot in sources ; 10R to 20R trimpot
xconductance of tiny TO92 Toshiba critters is (taken midrangey) 15mS ......... you can see it as ~65R resistor (1/S)
so, 65R + 10R up, 65R + 10R down, means 75R up and 75R down, means 37R5
easypeasy
dunno what's standard preamp, but everyone who heard this one agree that it isn't standard
regarding preamp Rout - I don't care for it - as long it is low enough
now ....... just imagine what happens with Rout when you have AVC in place of fixed autoformer ..... set with no gain and say that you took signal to output from -6db tap?
2^2 = 4 and 4^2 = 16? .....is this how it is interpreted?
6 dB will be enough for me. So 2^2 x 37,5 = 150 ohm in this case for total output impedance?
The DC-loss in the transformer windings is small compared to this?
This I can look up in the data sheet for the Cinemag.
6 dB will be enough for me. So 2^2 x 37,5 = 150 ohm in this case for total output impedance?
The DC-loss in the transformer windings is small compared to this?
This I can look up in the data sheet for the Cinemag.
when speaking of overall Rout, you're ignoring Rdc of xformer windings; that fact is important, but not in this analysis
Is there a chance that these kits might be available to be received before Christmas?
hohoho....
Even the mightiest, zaniest, (sp. check did that, and I like it), and zennest of mods has very little control over the timing at this phase.
So, maybe. 🙂