Blue and Gold has my vote.
I'm pretty sure Mark has a bunch of '50 boards, but if not, I can spare a couple. Just my take me a while to find the box (recent house move)
Ryan
I'm pretty sure Mark has a bunch of '50 boards, but if not, I can spare a couple. Just my take me a while to find the box (recent house move)
Ryan
Yes, I still have them. Send me a priovate IM though DIY and I'll give you the details. Will at last be mailing on Saturday to people waiting a long time for them.
Mark
Mark
i seem to have bad luck sendingemails through the forum - they never seem to make it...i sent one yesterday, hopefully it went through. if not, my email is bikehorn@gmail.com and i would just love a set of boards. thanks mark!
Boards
Mark
You had me worried re the black board but so nice to know you also like blue!
The bottom line should be that the board must be optimised for sound and durability - that means including the solder mask and not looks. I mean how many of us are going to look at the boards once the amp is fully boxed up?
The other things is are you going to offer special deals on the Pinkmouse KSA50 boards in combination with the KSA100 mk2 boards?
Jozua
Mark
You had me worried re the black board but so nice to know you also like blue!
The bottom line should be that the board must be optimised for sound and durability - that means including the solder mask and not looks. I mean how many of us are going to look at the boards once the amp is fully boxed up?
The other things is are you going to offer special deals on the Pinkmouse KSA50 boards in combination with the KSA100 mk2 boards?
Jozua
To be honest, standard green 2oz copper with no goldplating on the thicker substrate would be fine by me.
I think you need to submit the different quotes to the PCB house to get an idea of pricing so we can decide properly. Will you be using Advanced again?
I think you need to submit the different quotes to the PCB house to get an idea of pricing so we can decide properly. Will you be using Advanced again?
Well, I for one have been known to put plexi-glas tops on at least some of the more presentable gear that I've built..... There is no real reason we can't have all the stuff everyone wants... None of those adds all that much to the pricing.
Mark
Separate output mosfets/ fets
I just wanted to verify if there will be separate output mosfet boards so that I could build the KSA-100 to be 4, 2, 1 ohm stable? Double the power output with lower impedances. 200 Watts at 4 ohms for my brother's Apogee Divas.
I assume, I would need more than 4 output devices to handle that?
Thanks, Bill
I just wanted to verify if there will be separate output mosfet boards so that I could build the KSA-100 to be 4, 2, 1 ohm stable? Double the power output with lower impedances. 200 Watts at 4 ohms for my brother's Apogee Divas.
I assume, I would need more than 4 output devices to handle that?
Thanks, Bill
Hi,
the 100 runs twin drivers (that's four in total).
That requires that the output stage uses parallel configurations in multiples of four.
One quad set is HALF what Krell fitted as standard.
Two quads sets is the standard Krell fitment (commonly referred to as four pair).
This will manage 200W into 4ohms all day.
2ohm music duty is also well within it's capability.
the 100 runs twin drivers (that's four in total).
That requires that the output stage uses parallel configurations in multiples of four.
One quad set is HALF what Krell fitted as standard.
Two quads sets is the standard Krell fitment (commonly referred to as four pair).
This will manage 200W into 4ohms all day.
2ohm music duty is also well within it's capability.
Bill,
The 100 was built to run the Apogees and is pretty much the whole reason it came to exist. KRell also made an electronic x-over for the apogees as well. I've seen those for sale on Audiogon but theyar pretty rare.
Mark
The 100 was built to run the Apogees and is pretty much the whole reason it came to exist. KRell also made an electronic x-over for the apogees as well. I've seen those for sale on Audiogon but theyar pretty rare.
Mark
Driver board #2 is up and running just fine after finding a very tiny solder bridge on Q-2's pads. Again these pads are so tiny that soldering SMT components could be characterized as being easier. Am short 1 MJ21194 so will borrow one from the KSA-50 till I get a few more. Got to hear both channels this weekend... probably on Sunday. I also have a 2KVA tranny from a 6 channel 300 watt pc AB systems amp that if I strap the primary for 220 volts operation will get me very close to the needed +/- 52 volt rails.
MArk
MArk
Mark A. Gulbrandsen said:
I've heard the Divas with KMA200s late 1988 or 1989, about the time the Diva model was introduced.(first time here anyways)
The KSA100 was more around the time of the Scintilla, IIRC.
The Divas don't need that much voltage, but plenty of current imo. iiwy, i'd do more than 4 pairs in the output stage.
Active crossover
Todd actually purchased the very fancy LCD original active Apogee Dax crossover with a lot of settings compared to the passive crossover, although the passive Todd built on his own.
FYI,
Todd bought these Apogee Divas when he was out of high school. He paid like $7K for them with a 2 year loan. They were used one year old from a doctor. Todd used the Adcom GFA565 mono block amps, which he still uses occasionally. 2 ohms were 850 Watts RMS. At 4 ohm 450 W RMS.
Bill
Mark A. Gulbrandsen said:
Todd actually purchased the very fancy LCD original active Apogee Dax crossover with a lot of settings compared to the passive crossover, although the passive Todd built on his own.
FYI,
Todd bought these Apogee Divas when he was out of high school. He paid like $7K for them with a 2 year loan. They were used one year old from a doctor. Todd used the Adcom GFA565 mono block amps, which he still uses occasionally. 2 ohms were 850 Watts RMS. At 4 ohm 450 W RMS.
Bill
The Adcom had an output stage with 10 2SD424/2SB554.
Toshiba, 150 watt TO3 devices, 15 amps/ 160 volts.
Adcoms had very hot running driver stages and were known to blow on Infinity and Apogee models, despite all the protection circuitry.
I suppose Todd still has such good hearing that he doesn't enjoy driving the Diva to the Thunderdome dB levels it's capable of.
Toshiba, 150 watt TO3 devices, 15 amps/ 160 volts.
Adcoms had very hot running driver stages and were known to blow on Infinity and Apogee models, despite all the protection circuitry.
I suppose Todd still has such good hearing that he doesn't enjoy driving the Diva to the Thunderdome dB levels it's capable of.
jacco vermeulen said:
It's nice to have the overhead when you have a cresendo in a symphony. The Apogee bass was the best bass I have ever heard with no box sound.
I even prefer the bass of the Divas to my Klipsch cornerhorn.
The Apogees go very low in frequency compared to my cornerhorn, although the cornerhorn seems to be faster than the panel in bass speed attack. Plus the horn has a box sound compared to a dipole panel.
Frankly, all of my speakers could be deafening on their rms levels, so I never take them up to full volume.
Bill
HELP!
The second channel is passing audio but won't turn on the output stage! The funny thing is that it all pretty much checks out till I get to the collector of Q-9 and 10 which are about 1 volt lower than the working channel. All semis were removed and tested and all seem to be good. I have not tried replacing the MOSFETS or current diodes yet but they test the same as new ones do with my DVM. Voltages on the working channel biased to 300mv are as follows...... The problem seems to be at Q-9 and Q-10 with lower collector voltages.... Approximately 2 volts instead of the 3.0 needed. The collectors of Q-11 and Q 12 are about .58 volts and should be 1.4 volts. All other voltages are with in a tenth or two of a volt. DC balance is also working fine as is the bias adjust but there is just not enough voltage to turn on the output stage.
Any help here is appreciated!
Q-1 Emitter .58 Base 0 Collector 32.1
Q-2 .59 0 32.2
Q-3 -.57 0 -32.5
Q-4 -.57 0 -32.5
Q-5 Drain 50.4 Gate32.1 Source 30.9
Q-6 50.4 32.2 29.7
Q-7 -50.3 -32.5 -29.9
Q-8 50.3 -32.5 -29.9
Q-9 Emitter 51.5 Base 50.4 Collector 3.0
Q-10 -51.5 -50.3 3.1
Q-11 3.0 1.5 1.4
Q-12 3.1 1.4 1.4
Q-13 1.4 .8 1.4
Note that at 300mv bias setting the drivers Q-14 to 17 provide about .85 volts to turn on the output devices.
The second channel is passing audio but won't turn on the output stage! The funny thing is that it all pretty much checks out till I get to the collector of Q-9 and 10 which are about 1 volt lower than the working channel. All semis were removed and tested and all seem to be good. I have not tried replacing the MOSFETS or current diodes yet but they test the same as new ones do with my DVM. Voltages on the working channel biased to 300mv are as follows...... The problem seems to be at Q-9 and Q-10 with lower collector voltages.... Approximately 2 volts instead of the 3.0 needed. The collectors of Q-11 and Q 12 are about .58 volts and should be 1.4 volts. All other voltages are with in a tenth or two of a volt. DC balance is also working fine as is the bias adjust but there is just not enough voltage to turn on the output stage.
Any help here is appreciated!
Q-1 Emitter .58 Base 0 Collector 32.1
Q-2 .59 0 32.2
Q-3 -.57 0 -32.5
Q-4 -.57 0 -32.5
Q-5 Drain 50.4 Gate32.1 Source 30.9
Q-6 50.4 32.2 29.7
Q-7 -50.3 -32.5 -29.9
Q-8 50.3 -32.5 -29.9
Q-9 Emitter 51.5 Base 50.4 Collector 3.0
Q-10 -51.5 -50.3 3.1
Q-11 3.0 1.5 1.4
Q-12 3.1 1.4 1.4
Q-13 1.4 .8 1.4
Note that at 300mv bias setting the drivers Q-14 to 17 provide about .85 volts to turn on the output devices.