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December was the last time this was brought up.
You have so many parts that one can use to make this that I wonder if you might post a schematic of your implementation?
Seems like the LUNDAHLs are the easiest choice to make for this and your regulator looks like an easy way to accomplish that.
I have been putting off assembling one waiting to see what you have done.
Any chance of showing us what you have done? A PCB would be nice but as simple as the circuit is not necessary.
Follow Ups:
I have developed a series of simple ala carte kits that can be used, which include a choke loaded raw DC filament supply to feed a regulator, a B+ power supply board, a shock mounted tube socket board to minimize microphonics and improve pin contact, and, of course, there is the shunt regulator kit. I just finished the socket boards, which include a heat sink for the cathode resistor. I will be posting this stuff for sale after I return from vacation.
The block diagram of the schematic is attached for my personal unit.
Kevin Carter
K&K Audio
www.kandkaudio.com
Excuse my impatience.
Would like to plan around your plans.
Thanks and take care,
???
I am getting the feeling this is NOT a priority!
Well, I guess that I have more than just a feeling about the 4P1L preamp parts, because I've been steadily working on them and getting them incorporated into a working preamp to be sure that they all play nice with each other. Thankfully, they do play nice with each other and the sonic results are better than those gotten with my hastily cobbled together second prototype.
The trouble with running a business like mine is that you don't always get to work on one thing. Orders to fill, purchasing to do, accounting to do, e-mails and phone calls to answer, etc., take up the lion's share of my time. Prototyping and product development get the rat's share of my time. I'd rather do the latter, but who'd do the rest? Well, enough whining about my time...
I need to finish the kit documentation and get some kits up on the website. It's a priority, but it's not the sole priority.
Kevin Carter
K&K Audio
www.kandkaudio.com
Looking forward to it.
I have been putting this project off for quite awhile (other things took precedence) but now I am ready and know your parts will make the job MUCH easier.
Have the COLEMAN regs just need the regs, transformers and whatever else you offer.
Enjoy the time away while we look forward to that next post!
Thanks and take care,
Hi Kevin,
Have you tried using this tube as a PP driver stage? I have a couple pair of the LL1660 IT's along with some 4P1L's and have thought of trying them this way. It seems like the noise issues related to biasing might be a bit less critical in a PP scenario.
Thanks,
John
De gustibus non est disputandum
I haven't had the chance to try this, but at least one customer has. You can probably find him on the web by searching on 4P1L PP amplifier.
Kevin Carter
K&K Audio
www.kandkaudio.com
Works fine. A DIY pal made an amp PP balanced right through, 26> 4P1L> 6C4C. Very nice sound. He used a tube as a current sink under the diff pair, and direct coupled the 26s. LL1660/PP into the finals.More generally, I use a 4P1L into PSE 4P1L amp and have for over 2 years now. Where I'd suggest using this "line stage" is as the driver stage in a 2 stage amp. With 27mA through the 4P1L it's made for this. With PSE 4P1L finals you might not need a preamp if you use a DAC only.
Edits: 10/26/15
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