RE: audiotek
Hi everybody
I have almost the same story with Audiotek at 12 Feb. I paid 2 tubes via paypal to diy.texas@gmail.com. Up till now I did not get it. Also no response to my mails.
datesx
Hi everybody
I have almost the same story with Audiotek at 12 Feb. I paid 2 tubes via paypal to diy.texas@gmail.com. Up till now I did not get it. Also no response to my mails.
datesx
Balanced F5
It should work, according to Pass, and given the current capability he advertises - up to 10A, it should work well even with 4 ohm speakers. I would guess you will see at least 100W per F5 pair in AB with the first 50 watts in Class A, with the right heat sinks, (important consideration). I plan to build three of 'em, once I figure out what to do with the case. barredboss's new 11" x 2.75" deep extrusions might be just the ticket.
I've decided my pretty Chinese D-988 amp case just doesn't have the heat sink capacity to handle two bridged F5's, so I am saving it for an (unbridged) F3. (Yes, I am crazy, bored with my day job and love scavenger hunts.) BTW, has anybody built a Erno Borbely line stage lately ? They use a lot of parts, but they allow you to tailor the gain, and would drive an F3 to full output for all sources. I'm am also curious as to what Pass is doing with the B3...a single SE 2SK170BL on the front end of a B1 ought to give you 10 dB of gain easy.....
I'd love to see what the bridged F5 version looks like on an Audio Precision tester.....if any of you guys own one of these jewels and have hooked your F5 up to it, let us know how it did. As conservative as Nelson is, I'll bet it will run pretty clean right up to the voltage limits of the PS. I'm still a few months away from getting mine together, (given my day job...).
It should work, according to Pass, and given the current capability he advertises - up to 10A, it should work well even with 4 ohm speakers. I would guess you will see at least 100W per F5 pair in AB with the first 50 watts in Class A, with the right heat sinks, (important consideration). I plan to build three of 'em, once I figure out what to do with the case. barredboss's new 11" x 2.75" deep extrusions might be just the ticket.
I've decided my pretty Chinese D-988 amp case just doesn't have the heat sink capacity to handle two bridged F5's, so I am saving it for an (unbridged) F3. (Yes, I am crazy, bored with my day job and love scavenger hunts.) BTW, has anybody built a Erno Borbely line stage lately ? They use a lot of parts, but they allow you to tailor the gain, and would drive an F3 to full output for all sources. I'm am also curious as to what Pass is doing with the B3...a single SE 2SK170BL on the front end of a B1 ought to give you 10 dB of gain easy.....
I'd love to see what the bridged F5 version looks like on an Audio Precision tester.....if any of you guys own one of these jewels and have hooked your F5 up to it, let us know how it did. As conservative as Nelson is, I'll bet it will run pretty clean right up to the voltage limits of the PS. I'm still a few months away from getting mine together, (given my day job...).
power supply
I've been planning on building an F5 stereo amp, coupled with a B1 buffer in the same chassis for a while now.
The power supply would be in 1 chassis and the signal level stuff in another. To save on space/cost/time I thought I'd build a ZV5 power supply with a 600VA 25V transfomer (only $65 at antek), and have that feed the positive and negative rails on the right and left channels of the B1 and F5. I'm obviously concerned about crosstalk esp as it may affect the B1.
My question is this: If I place several transistors (q3) in parallel with each its own cap (c8), but all fed by the same unregulated supply and zener, will I decouple each supply from each other sufficiently?
Thanks.
I've been planning on building an F5 stereo amp, coupled with a B1 buffer in the same chassis for a while now.
The power supply would be in 1 chassis and the signal level stuff in another. To save on space/cost/time I thought I'd build a ZV5 power supply with a 600VA 25V transfomer (only $65 at antek), and have that feed the positive and negative rails on the right and left channels of the B1 and F5. I'm obviously concerned about crosstalk esp as it may affect the B1.
My question is this: If I place several transistors (q3) in parallel with each its own cap (c8), but all fed by the same unregulated supply and zener, will I decouple each supply from each other sufficiently?
Thanks.
This, you may have seen, maybe not. But it goes over lots of this in terms I can understand, for the most part. And trust me, if I get it anyone can get it 
http://www.firstwatt.com/downloads/F5-om_sm-080527.pdf
Uriah
http://www.firstwatt.com/downloads/F5-om_sm-080527.pdf
Uriah