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Old 16th February 2011, 10:15 PM   #31
mpuman is offline mpuman  United States
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Thanks jazbo8.

We have settled on the sch that uses a 12AU7 (or 12AT7) direct coupled to a 6L6GC then IIT to the 805. We have a couple of different transformer mfg on the magnetics and are hopeful to have some samples in the coming weeks. It is a slow process. We are making good headway. Stay posted as we are continuing the process and will be looking for more input into other concepts and ideas that we are working on with this design.
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Old 22nd January 2013, 10:41 AM   #32
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Thanks jazbo8.

We have settled on the sch that uses a 12AU7 (or 12AT7) direct coupled to a 6L6GC then IIT to the 805. We have a couple of different transformer mfg on the magnetics and are hopeful to have some samples in the coming weeks. It is a slow process. We are making good headway. Stay posted as we are continuing the process and will be looking for more input into other concepts and ideas that we are working on with this design.
Bumping an old thread, whatever happened to the 805 SE kit?
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Old 22nd January 2013, 01:38 PM   #33
mpuman is offline mpuman  United States
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Hi jazbo8

Finally we have a sweet design on all the transformers! I should have some in house mid-March. Very, very slow process. After a false start and many wasted months with an Indian mfg, we found and identified the the best of China. Not too many mfg that actually can make these at an affordable price. Lots of back and forth. Thankfully I have a good contact in China.

What I can tell you is the interstage and output xfmrs are 'C' core and so sweet. We have made some tweaks in the design to expand and flatten even more. Freq response of the ITT is like +/- 0.5dbm 8Hz-100Khz. OTP not quite so high on the ends. Power xfmrs are 'R' core. It will be a few months after we receive them until we have some kits together.

All teflon sockets, film caps in the power supply, CC for the 805 heater. Input either balanced or single ended. Can't tell you much more ...
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Old 22nd January 2013, 01:44 PM   #34
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ITT is like +/- 0.5dbm 8Hz-100Khz.!!!
I look forward to see what a wonderful made isthat ?they broke the Tango records!
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Old 22nd January 2013, 02:45 PM   #35
mpuman is offline mpuman  United States
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yep ... although Tango was nicely designed, I don't think they used a C core, nor had the low cost labor to make such a labor intensive design without busting the bank. Our IIT is much larger than the typical Tango and other units ... obviously needed for the the low end.
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Old 23rd January 2013, 12:12 PM   #36
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@100KHZ-what kind of waveform pattern is here?
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Old 25th January 2013, 02:00 PM   #37
mpuman is offline mpuman  United States
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very clean sinewave
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Old 25th June 2013, 03:14 PM   #38
TBL is offline TBL  Hong Kong
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I have been lurking for a while. As a recovering audiophile from the past, I am convinced that I want to do a monoblock based upon the 805 to restart my interest. Have been designing and mfg all sorts of electronics for several decades, so experience I have plenty of.

With contacts and suppliers in Taiwan, HK, China, & the US, for just about everything, I have no real issue of putting it together other than if I should and of what design / features.

The production side of me sez, if I'm going to do 2x units, why not do 30x or so to start. The design that I am leaning to is based upon Bauanleitung fuer einen 805-Verstaerker, von Ronald Koridon - really like the concept - but in monoblocks. Thinking of canning the B+ silicone in favor of valve rectifier.

The reason for the thread is to get some idea if there is any interest in the future kit. No, I don't know the price yet - as it is only in planning, but I am sure it will not be cheap - but will be reasonable. The iron is very pricey as you guys know. My guess it might be 4-6 months until ready to ship.

I just acquired a pair of Hytron 805. So if you can offer this in kit form or sans tubes, I'd be interested in hearing further.

Right now I am working with some well known and not so well known trany mfg to get some ideas. It is really interesting, one of my 'normal' domestic suppliers used to source the Acrosound back in the day ...

Open to all suggestions and patter - perhaps it will get all of us that are interested in this style of amp an easier and better way to put it together - or on the other hand, it might kill the project!
I had a China made 845 SE amp called Line Magnetic LM219IA. It just struck me how smooth and yet powerful this one sounded. But since there are too many SE amps of 845/805/211 designs, won't it be more attractive to the general audiophile if a PP 805 is produced and offered for limited sale?

Last edited by TBL; 25th June 2013 at 03:16 PM.
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Old 25th June 2013, 11:38 PM   #39
multi is offline multi  Australia
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I Built 805 mono blocks 750 volts, Se amp; using a 3.5K sowter out put transformer, driven by a 6BL7 cathode follower and 12HG7 pentode. The 805 works very well push pull too; I prefer PP to SE even though i use 100db horns. The original were made with Ex military power transformers and chokes and separate power supplies. I hope to rebuild as mono blocks using C core power transformers.
Phil
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Old 26th June 2013, 12:03 AM   #40
TBL is offline TBL  Hong Kong
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My GE JAN CRC 805 came to me at US$4/pair on ePay. This was the seocnd best deal I got there. The top one was a pria of NOS 6973 for 0.99 Yep.

Yea I know, at 990 VDC, it is a one way ticket to tube power heaven at one touch! I tried 330 and 400 VDC, once each! I won't try the 805 that way, tho'.

So I am getting restless with the following items lying around:

1. 2 military trannies
920-0-920 125 ma
510-0-510 110 ma
5V - 4A
6.3V 5.5 A

2. pair of 805 GE JAN CRC

3. a lot of 6SN7 and 12SN7

4. a lot of 6CG7

5. a lot of pentode 6BH6

6. a few paris of 5876

7. many quads of 6973/6CZ5/6CM6/6DT5/6EM5

8. SE OPT: One Electron UBT-3

I don't wanna try the UBT -3 OPT coz it is only rated at 30W. As I said, I think I would like PP for more power. I think a custom design is necessary with the spare items above to make one pair of PP mono's. Anyway, I now know that the 805 is even more powerful than the 845. The 805 can run 1.5k VDC, and heat dissipation of 125 Watts versus 100 W of the 845. I think a PP 805 is probably a gem to modern speakers, at least to my Celestion SL700, at 82.5 dB @ 1 Watt SPL. I have seen some schematics running it at 990VDC or so, extracting 40-45 Watts per channel from a SE design. I hope 100 WPC is achievable from PP.

I just would like to know if someone can point me to a practical schematic. Thanks!

Last edited by TBL; 26th June 2013 at 12:11 AM.
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