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Old 13th November 2010, 01:59 AM   #21
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Quote:
Originally Posted by moparman View Post
Anyone try these yet Genalex - Gold Lion N709 / EL84
I am currently using JJs and very happy with them
I have a quad of GL's in shipment. But I don't think I'll plug them into my SP-P until I throttle down the B+ a bit.
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Old 13th November 2010, 07:27 AM   #22
Ian444 is offline Ian444  Australia
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George, speaking of favorite output tubes, have there been any, or many, requests for a 6V6 Simple PP? There doesn't seem to be many 6V6 projects around, Poindexters musical machine is the only one that comes to mind. It does look like the current circuit would easily accomodate 6V6, except for the octal sockets for the output tubes.
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Old 13th November 2010, 04:45 PM   #23
chrisb is offline chrisb  Canada
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Originally Posted by Ian444 View Post
Chris, 2nd post here for schematic:
SP-P final connections?


thanks Ian - somewhere along the line I'd seen George's schematic as well, but my eyes aren't what they used to be be, and yours is much easier to read.
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Old 13th November 2010, 08:30 PM   #24
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Quote:
and yours is much easier to read.
I like his better too. If Ian agrees I can put it on my website, make it a sticky here, or both.

Quote:
have there been any, or many, requests for a 6V6 Simple PP?
When I decided to do the simple P-P I asked for suggestions. There was very little interest in a 6V6 based amp. The requests were about evenly split between an EL84 based amp making about 15 WPC and an octal tubed amp in the 35 to 50 WPC. Putting 5 octal tubes plus driver circuitry on one PC board with reasonable spacing makes for a rather large board. Too large for economical manufacture.

The plan was to do the Simple P-P since it was highly requested, and then follow up with the octal amp. The Simple P-P boards are not selling well and sales of the other boards have dwindled down to 1 or 2 a week. I have friends in similar businesses (non audio electronics boards and kits) and they report similar situations. The worldwide parts shortages and crummy economy are likely to blame.

I have several versions of octal P-P amps breadboarded. All versions use at least two PC boards. The most likely solution uses 3 boards, one for each channel and one for the power supply. The 6V6 would work in any of these designs as it does in the Simple SE. Different transformers choices are required though.
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Old 13th November 2010, 09:49 PM   #25
Ian444 is offline Ian444  Australia
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Fair enough, I was doing some experimenting with 6V6 hence the question. Shame about the world economy, seems to put a damper on all things good

Regarding the schematic, feel free to use it any way you see fit. You can remove my name if you want, I only put it there so people would know its not a genuine approved schematic. I could also do versions showing triode and pentode mode wiring if you would like, it would take very little time to do that.
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Old 13th November 2010, 11:13 PM   #26
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Originally Posted by Ian444 View Post
There doesn't seem to be many 6V6 projects around, Poindexters musical machine is the only one that comes to mind. It does look like the current circuit would easily accomodate 6V6, except for the octal sockets for the output tubes.
I don't think anyone mentioned "El Cheapo".

jeff
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Old 13th November 2010, 11:51 PM   #27
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Quote:
Regarding the schematic, feel free to use it any way you see fit. You can remove my name if you want, I only put it there so people would know its not a genuine approved schematic.
I will leave it as is. You made it, you deserve the credit. I have been stuck at work lately until late every evening, so I haven't had the time to even catch up on email. The place where I work restated their "use of company property" policy. It is now stated that any activity promoting a personal business is prohibited. Since Sherri lost her job two years ago, I need to hang on to mine and they are still laying people off.

Quote:
I could also do versions showing triode and pentode mode wiring if you would like, it would take very little time to do that.
I have been asked for a complete schematic, and I have been referring people to your post. Schematics for the triode and pentode options would be useful.

Quote:
Fair enough, I was doing some experimenting with 6V6 hence the question
I know that you are familliar with the conversion of the Simple SE board to P-P thread. The thread starter now states that the 6V6 tube is his favorite tube in that amp. If you want to explore that route I can send you a couple of boards to play with.

Quote:
I don't think anyone mentioned "El Cheapo".
There are lots of schematics floating around that will work with the 6V6. Most schematics for 6L6 type amps will work for the 6V6 with power and output transformer changes.

The Simple SE was a big hit (I have sold over 100 boards) because it is SIMPLE. It doesn't take much thinking to build it. It is a good "first build". It is not too different from other SE amps that have become quite popular. The Abdellah design is one. The Simple P-P is not too different from the RLD or the Bevois Valley amp either.

I see someone currently trying to put together a kit based on the Abdellah design over in the "Tubes" forum. It is the right time of year since more people in amps in the winter, but I think this might be the wrong year to try this.

I found that many people want to build their own chassis too. If you look at all of the pictures of my amps you will find them stuffed into $10 cake pans, and you will find $500 custom made chassis. You will find them with $30 Edcor OPT's and megabuck Tamura's.
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Old 14th November 2010, 05:39 AM   #28
Ian444 is offline Ian444  Australia
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Here's the schems, if you want any alterations done just let me know:

http://i198.photobucket.com/albums/a...chemTriode.gif

http://i198.photobucket.com/albums/a...hemPentode.gif

http://i198.photobucket.com/albums/a...ePPschemUL.gif

You are too generous offering some boards, thank you, but I already have a couple of experiments/projects running. You are right, the Simple SE x 2 would be the way to go, and a single PCB with 4 or 5 octal sockets gets too big. I did fit some 6V6 to an amp that was previously 6L6, and this is my latest crude experiment, however, the Simple PP still rules in my house. It does seem though from my diminutive experience that fixed bias (or LED's instead of cathode resistors) is the silver bullet for small PP amps, as you have mentioned/hinted at a couple of times. It also takes away the "simple" part, so I understand why it's not standard. Anyway, I'm getting off-topic...
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Old 15th November 2010, 07:02 PM   #29
Jaap is offline Jaap  Netherlands
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ERROR
The requested URL could not be retrieved

While trying to retrieve the URL: http://i198.photobucket.com/albums/a...hemPentode.gif

The following error was encountered:

* Zero Sized Reply

Footprint did not receive any data for this request.
Footprint 4.6/FPMCP
Generated Mon, 15 Nov 2010 20:01:50 GMT by 192.221.115.126 (Footprint 4.6/FPMCP)
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Old 15th November 2010, 09:35 PM   #30
chrisb is offline chrisb  Canada
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Ian- thanks again for posting the links - I note that your pentode version doesn't indicate the potential change of screen resistors to 820R - just to clarify that's when using without feedback?
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