One more question, what voltage rating would be needed to use a rotary selector switch to change between the CCS taps? The highest rating I can find on Mouser w/ Grayhill switches is 28V DC. Would that be pushing it? Would that switch see the 28V DC before the output coupling cap?
use some big hog switch , rated for 15 or 20A min.
voltage is not a problem , problem is contact impedance (resistance) ..... and higher rated are having smaller losses at contact
voltage is not a problem , problem is contact impedance (resistance) ..... and higher rated are having smaller losses at contact
My solution : 50w Single-Ended BAF2015 Schade Enabled
Point A and B have higher distortion numbers only C or D give better sound imho.
IXYS triode emulation distortion at the center tap C are very similar to 2SK77B
Point A and B have higher distortion numbers only C or D give better sound imho.
IXYS triode emulation distortion at the center tap C are very similar to 2SK77B
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Thanks for the help guys!
I'm actually going to be using the 2SK77B circuit w/ either a 2SK182 or THF-51S and wanted to listen to all 4 positions to pick what I liked best. No offense on your opinions Soundhappy, but since the lower taps are hearing mainly just the SIT with no mosfet contribution...I wanted to at least give those a try. I had seen your implementation, and it is perfect for selecting one of 2 positions, but wouldn't help w/ the 4 unless I cascaded 3 switches which would start to look a bit off 🙂
And thanks ZM...I hadn't thought about the contact resistance issue. I found this badboy:
19001-04UL Grayhill | Mouser
I could give that a try, or else I guess go with the "not as easy to change" method, and use a short large-gauge wire jumper.
Not sure how I missed that switch in the first place while browsing Mouser. Spendy, but I would assume bulletproof!
I'm actually going to be using the 2SK77B circuit w/ either a 2SK182 or THF-51S and wanted to listen to all 4 positions to pick what I liked best. No offense on your opinions Soundhappy, but since the lower taps are hearing mainly just the SIT with no mosfet contribution...I wanted to at least give those a try. I had seen your implementation, and it is perfect for selecting one of 2 positions, but wouldn't help w/ the 4 unless I cascaded 3 switches which would start to look a bit off 🙂
And thanks ZM...I hadn't thought about the contact resistance issue. I found this badboy:
19001-04UL Grayhill | Mouser
I could give that a try, or else I guess go with the "not as easy to change" method, and use a short large-gauge wire jumper.
Not sure how I missed that switch in the first place while browsing Mouser. Spendy, but I would assume bulletproof!
you're going to change taps only in first listening tests , and hopefully leave it later in one position
so , spend switch money on something else , do it any other way for testing
these things are sweet to have when you can buy them surplus
so , spend switch money on something else , do it any other way for testing
these things are sweet to have when you can buy them surplus
You're right...I guess I just like mechanical trinkets 😉
Makes most sense to have a "jumperable" position on the board and then solder in the final position that I like.
Makes most sense to have a "jumperable" position on the board and then solder in the final position that I like.
Ah OK You build with big Tokin's !
I understand better now , try all four CCS taps positions can be fascinating audio experiment
specially with the " Ninja Tune " record label music 😀 Have fun
HAHA...yup! It was my favorite label through college 25 years ago. They still have some great releases, but when the owners sold the company I feel that it slipped a bit. Luckily I still have all my old records!
Thanks for the well wishes. Hopefully it doesn't generate too much heat here in the summer.
Luckily I'm in Maine, so it's currently been nice and cool so far this year.
A couple things puzzling me are for one, why is a regulated supply so desirable? And two, later in the thread 1.2 was used to calculate the recommended transformer secondary voltage instead of 1.4. A minor point?
Anyways, I'm highly motivated to build the full 60V version!
Regards,
Dan
Papa didn't said he used regulated supply , so why should you ?
1.2 for multiplicator is say thumb of rule
- 1.41 being for unloaded rectifier+filter , 1.2something being for loaded rectifier+filter
when you are walking freely , you 're tall - how much?
when you're walking with cement bag on your shoulder(s) , you're tall how much minus 2 inches
1.2 for multiplicator is say thumb of rule
- 1.41 being for unloaded rectifier+filter , 1.2something being for loaded rectifier+filterwhen you are walking freely , you 're tall - how much?
when you're walking with cement bag on your shoulder(s) , you're tall how much minus 2 inches
i have built mine with a 600VA 2X45V i gives me 60V B+ loaded and 64V unloaded 80V capacitor or more will suit well 🙂
I just ordered two of these AN-8445 - 800VA 45V Transformer - AnTek Products Corp. I'm very pleased that these include some low voltage secondaries for fans or other accessories.
Regards,
Dan 😉
Regards,
Dan 😉
Starting around post #83 of this thread are conflicting opinions of what Pa is recommending. I hope my unregulated CLC will do.
Regards,
Dan