February 22, 201214 yr I honestly don't know, I just took it literally, it seems Oscar did get the better of me, I have a PS 900 shipping my way. I was joking, you almost certainly interpreted Ben correctly. Congrats on the PS900. Good tools are good investments.
February 22, 201214 yr I'd forgotten Oki is (or bought) Metcal... those are nice. My Hakko works fine for me though. I have a 3.2mm chisel tip that I use for anything large, and for most desoldering chores.
February 25, 201214 yr Author There is a new version of both of the amp boards with jumpers for local or global feedback for the next round of boards when needed. I still like the global feedback version better.
February 26, 201214 yr Just had a chance to hear T-Money's KGSSHV. I was very impressed with the results Were there any other changes to the new board layout besides giving the local feedback option?
February 26, 201214 yr Author No other changes. One version ago, lil-knight had me make the mounting holes for the heatsinks slightly larger.
February 26, 201214 yr Just had a chance to hear T-Money's KGSSHV. I was very impressed with the results How did you like it compared to your BH?
February 26, 201214 yr I thought the KGSSHV was much closer to the BH than the KGSS. Sound stage was nice and open, but the BH still sits a notch above for me. When I build my KGSSHV, I think i'm going to play with the bias current. I'll likely try something around 12mA x 4 for the current (will want to experiment with this a bit).
February 26, 201214 yr The HV can handle quite a bit more current so go nuts. The circuit is also very linear when the current is scaled up and down.
February 26, 201214 yr Author Power supply can supply as much current as you want. Transistors can take up to 4 times as much bias if you can get rid of the heat. Best done on the off board heatsink versions.
February 26, 201214 yr That'd bring the HV into essentially parity with the T2 as far as output power, right? Wow.
March 6, 201214 yr Proof that a 2U is all you need... It's running in that pic, I just couldn't be bothered to hook up the indicator LED. This was a difficult birth though with an intermittent pot in one channel and the other was just fubar. I swapped pretty much everything and it still didn't work so I finally gave up and built a new channel. That one also needed some work to get right. Still, build enough amps and once in a while one is bound to be like this.
March 6, 201214 yr Author I'm linking this one a lot. Needs a wood knob though. Now if customs would just pass thru the latest board sets from lil-knight i would be even more happy.
March 6, 201214 yr Beautiful build, Spritzer. So how high is team overkill going to crank the current?
March 6, 201214 yr I don't think messing with the current on the onboard sets is a good idea since it is hot enough as it is. Now with huge offboard sinks then the sky is indeed the limit and I'm going to go damn close... Now if somebody can spot my way of dealing with the 10M90 sinks with only metric screws at hand...
March 6, 201214 yr with the 4th stage bias at 8.3mA, the output devices will dissipate close to 4W of power (with a 450V supply), is this correct? Edited March 6, 201214 yr by ujamerstand
March 6, 201214 yr Author 3.73 watts for each of the 4 output devices .9 watts for both of the 3rd stage current sources (2ma) .9 watts for both of the 3rd stage amplifiers (2ma) About 20 watts for each amplifier.
March 6, 201214 yr Now if somebody can spot my way of dealing with the 10M90 sinks with only metric screws at hand... My eyes are bleeding looking for this.... Very slick build, I love the look, what knob did you use?
March 6, 201214 yr That is a gorgeous amp! I can proudly say that "I have the same knob as Spritzer". Those knobs were some that Justin sold a while back. I have 3 on my 'Tower of Power', and they're beautiful.
March 6, 201214 yr They are indeed a very good looking knob. I found your solution for the 10M90 Spritzer, longer screw, locked down against the sink with a broad washer...
March 6, 201214 yr My eyes are bleeding looking for this.... This should help... http://i.imgur.com/xgvci.jpg Not small... Edit: Yeah I went utter overkill on it. Some Loxeal too just for good measure. Very slick build, I love the look, what knob did you use? Yup, BHSE castoffs. Having the same knob as Steve is just the icing on the cake... Edited March 6, 201214 yr by spritzer
March 6, 201214 yr Author Somehow that is not the magazine i would not expect steve to be reading ?? Edited March 6, 201214 yr by kevin gilmore
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now