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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 08 Sep 2010, 08:12 
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Joined: 24 Jun 2010, 00:48
Posts: 788
Location: Christchurch, NZ
love the wiring !! :mrgreen:

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Dinesh

Some of my diy audio projects:


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PostPosted: 08 Sep 2010, 11:19 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Thanks for the compliment, I like it a lot, too. :) I kind of got used to it, gives it that vintage tough and I like old stuff. I am finished, well, I only can adjust B+ to 208 volts, so I have to exchange the two voltage droppers in the PSU against something a bit smaller, it is now 2,2k, I will go for 1,5k, that should give me sufficient overhead. 208 is just a tiny bit too low, if it would be 211 I would leave it right there, but it is not, so here I go. For the first testing and listening I will go with the 208 volts, need to get two 1,5k resistors tomorrow. Now I wanna hear it.

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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 08 Sep 2010, 16:46 
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Joined: 08 May 2009, 08:20
Posts: 918
Location: Duesseldorf, Germany
Hey Ben, hey all.

Yep - Ben is a real wiring and etching ACE. I guess he takes himself a lot of time for the preparations and the layout.
IMO - one of the most important things at all.

Congrats Ben, i also like your work very very much!!!

[ger on] Bernd - da kann man schon tierisch neidisch werden! Gelernt ist halt gekonnt...Hut ab! [ger off]


Have fun ;-).

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Cheers,
Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 10 Sep 2010, 05:45 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi Everybody,

First of all, do not use the same tubes I used, while they sound sweet, they are very sensitive to collecting noise out of the air and they draw twice as much heater current than our 9 pin dual triodes. I had this amplifier before with EEC802S, this is the much better choice, I had to do a lot of unorthodox things to make this work for me now. So if you need a pre amplifier, go ahead, this is an excellent choice, just stick to schematic. I built this one while staying in close contact to Bruce and he has been so very helpful as usual, but the tube choice was bad, after all. By using 9 pin miniature my 6 volt controller would have worked, that is how it started. Well project is finished and so am I, haha, time to listen to some music, will give my spouse some money to go shopping so I have the house to myself......


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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 10 Sep 2010, 10:19 
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Joined: 04 Jun 2008, 20:59
Posts: 3646
Location: Arizona, USA
Hi Everyone, As usual Ben did a great job of the wiring and layout. Unfortunately the tubes he chose didn't cooperate. I have had similar experiences with 6SN7s. The circuit required a fair number of alterations to reduce the sensitivity to external noise. I won't say the ECC802S is a better tube, but IMHO it is a lot easier to use. For those who need more gain the 6DJ8/E88CC can be used with a few modifications. Be aware though that it has a slightly different pin arrangement and the cathode resistors need to be changed to 150 ohms. Also be aware that tube to tube and section to section matching may be an issue with some 6DJ8/E88CCs. I had to go through 6 brand new JJ tubes to get two that matched.

Good listening
Bruce

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PostPosted: 10 Sep 2010, 11:58 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi everybody,

yes Bruce nailed it down, bad choice of tubes. I may wanna try the Russian 6N1P instead. I had very good luck with those tubes before and I really like the sound. Those are very close to our E88CC. I don't know, yet. :D

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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 12 Sep 2010, 10:06 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi everybody,

my ForeWatt is doing a great job playing in Rotterdam at my friend Paul's house, feeding his Marantz amplifier. He is a total Marantz crazy, but slowly he comes around to tubes (my fault). If you check out the picture, the ForeWatt is standing right next to his tube RIAA, also made by me, haha, so that is a start, isn't it? Well, now I gotta make him a ForeWatt with friendly permission of Bruce. Thanks Bruce. So I get to build it again, but I did learn my lesson and I will stick to schematic recommendation.


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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 16 Sep 2010, 21:54 
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Joined: 04 Jun 2008, 20:59
Posts: 3646
Location: Arizona, USA
Hi All, Thanks for the kind words about the preamp. Pretty nice set of gear in the photo, but I wouldn't put my turntable on top of the equipment. :?

Good listening
Bruce

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PostPosted: 19 Sep 2010, 18:45 
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Joined: 14 Feb 2010, 13:13
Posts: 663
Location: Lisbon, Portugal
Congratulations Ben! You really did a good job!

I cannot do such a good wiring down here! You´re the "Wiring Boss" for sure!!!

Cheers,
Miguel

P.S. - Sorry for the non-replied messages at MSN, i´ve been working too much... Hope to see you soon! :)


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PostPosted: 21 Sep 2010, 23:59 
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Joined: 13 Nov 2009, 22:20
Posts: 41
Kind of off subject, but I picked up a Marantz DV6500 as a used CD player ($1oo US). Initial retail at $650 US, and this thing is fantastic. Sony CD, Samsung DVD, Alpine in the car, all skip, this thing plows through these CDs, and rarely, if every, have I heard a skip. Sound quality is fantastic. I run a NAD T163, Bruce's KT88s (Genalex), and Klipsch RF-7s, through a NADY GEQ-215. Sorry, someone mentioned Marantz, and I just had to insert myself, these things are an awesome bargain. Looking forward to putting together one of these preamps, thanks again, Bruce. We all appreciate your contributions. Loving the amps.

John


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