Well, maybe not at Ratshack but you can get 475 ohm resistors fairly easily. Digikey and similar distributors sell them. 🙂JOE DIRT® said:
JOE DIRT® said:
Doesn't get more standard than that...
However it seems funny to open a thread asking about a resistor that is clearly printed in the diagram...
UrSv said:
Who cares 😀 At least this way we get to see the "secret" Krell schematics... Pretty average looking if you ask me.
by the way Blueman, if you have more Krell schematics, please feel free to post!
-K
questions
Has anyone built this amp?
How many output devices?
How much bias?
How does it sound?
Is it worth doing a board for it?
Has anyone built this amp?
How many output devices?
How much bias?
How does it sound?
Is it worth doing a board for it?
Based on the schematic. looks like 3 pairs of outputs. If it runs 100watts class-A into 8 ohms, i'd say the bias is as follows:
Total bias 2.5 amp per rail.
Bias per device 0.84 (x3 devices for each cycle of push pull) .
voltage across each emmitter resistor = 416.6mv.
This amp will dissipate 235 watts per channel at idle.
All this is based on the 100 watt class-A spec and the values on the schematic.
Chocoholic and Millwood, did I make you proud? 😀
K-Amps
Total bias 2.5 amp per rail.
Bias per device 0.84 (x3 devices for each cycle of push pull) .
voltage across each emmitter resistor = 416.6mv.
This amp will dissipate 235 watts per channel at idle.
All this is based on the 100 watt class-A spec and the values on the schematic.
Chocoholic and Millwood, did I make you proud? 😀
K-Amps
the emitter resistor for the VAS stage (121ohm) is pretty big, considering that JC2 has a 20ohm or so resistor there.
The unbiased vue...
The unbiased electolitc capacitor in the emmiters of the LTP...is a strange feature...
Any comments?? 🙂
The unbiased electolitc capacitor in the emmiters of the LTP...is a strange feature...
Any comments?? 🙂
Re: The unbiased vue...
I think it is to reduce degeneration for a/c signals without causing excessive d/c offset. with the cap, the two 200r resistors are essentially tied together, thus no more emitter degeneration.
for a/c signal, the cap is open, thus each leg has a 200r resistor.
Tube_Dude said:
I think it is to reduce degeneration for a/c signals without causing excessive d/c offset. with the cap, the two 200r resistors are essentially tied together, thus no more emitter degeneration.
for a/c signal, the cap is open, thus each leg has a 200r resistor.
Tube_Dude said:
if this circuitry behaves like our simulation, the vas is likely running in the 1ma range.
maybe someone will have a service manual for the amp.
K-amps said:
With regards to the 3 pairs of outputs I think it could easily be 4 pairs as the schematic clearly says x4 for the output transistors.
millwood said:
Not needed the service manual...if the simulation gives you 1mA...your simulation is flawed...
The current un the VAS is +-8,3 mA...😉
PS : How a 1 mA current can drive a follower that is not even a triple follower but only a double!???
sound
Has anyone built this amp?
How many output devices? Now I see the X4
How much bias? 2.5 amps per rail
How does it sound?
Is it worth doing a board for it?
Can it be scaled down so to +/- 40 volt rails?
😀
Is anyone interested in boards if they are made?
Has anyone built this amp?
How many output devices? Now I see the X4
How much bias? 2.5 amps per rail
How does it sound?
Is it worth doing a board for it?
Can it be scaled down so to +/- 40 volt rails?
😀Is anyone interested in boards if they are made?
Re: Re: The unbiased vue...
Yes!🙂
No..i think that what you mean is....for DC !!! 😉
millwood said:
Yes!🙂
No..i think that what you mean is....for DC !!! 😉
Tube_Dude said:
I thought it was settled on that other thread that for such a topology, you cannot calculate VAS and LTP current. Assuming that the current in the LTP legs is evenly split is falwed.
hopefully, the time and effort there were not wasted.
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