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Old 5th April 2012, 03:09 AM   #1431
Cassiel is offline Cassiel  Libya
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OK, here's my stuff. Power supply schematic is not ready yet. The audio file is just a guitar, an amp, a micro and a computer. No editing apart from crude copy and paste. I start clean, then crunchy and then volume goes to 12.

http://www.fileden.com/files/2012/4/...king%20off.wav

More details about the amp with my next post, probably power supply schematic too. This is a lot of work. Both are the same schematic, just choose your fav color (lol).
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Old 5th April 2012, 03:47 AM   #1432
benb is offline benb  United States
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I see your first cathode resistor says it's 1500k - obviously you meant this to be 1.5k or 1500.
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Old 5th April 2012, 04:06 AM   #1433
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Spent some time and worked out how to add a floating paraphase PI to the 4 pole switch PI I posted. So a simple four pole three position switch will work (hopefully). I lifted a preamp from the guys at Watkins since I just got the tube in the mail and I want to try out the 25L6 tubes I have. The power supply still has to be worked out, just put some parts in place for the heck of it.

Click the image to open in full size.
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Old 5th April 2012, 04:29 AM   #1434
tubekit is offline tubekit  United States
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Quote:
Anyhow you got 100 dollars worth of parts waiting for you. You just have to send an email.
If I may ask, to what specifically does the above quote refer?
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Old 5th April 2012, 11:08 AM   #1435
Cassiel is offline Cassiel  Libya
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Quote:
Good luck!
Thanks Wavebourn, I didn't electrocute myself yet. So far luck is on my side.


Quote:
Originally Posted by benb View Post
I see your first cathode resistor says it's 1500k - obviously you meant this to be 1.5k or 1500.
Yes, 1.5K. Big blunder.


Quote:
If I may ask, to what specifically does the above quote refer?
Read post 1403. Hey you're on the list!
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Old 6th April 2012, 05:57 PM   #1436
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Quote:
Originally Posted by Printer2 View Post
Spent some time and worked out how to add a floating paraphase PI to the 4 pole switch PI I posted. So a simple four pole three position switch will work (hopefully). I lifted a preamp from the guys at Watkins since I just got the tube in the mail and I want to try out the 25L6 tubes I have. The power supply still has to be worked out, just put some parts in place for the heck of it.
Ah, great men think alike, here is Merlin's version (via AX84):

Click the image to open in full size.

Jaz
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Old 7th April 2012, 10:27 PM   #1437
Cassiel is offline Cassiel  Libya
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Quote:
great men

Where to?

Power supply is here! I knew you guys couldn't wait so.......

Three more facts:

1. Power supply caps come from a dead PS, a dead CFL and the poly one is made here in Madrid. Proud of being crap, she is.

2. I did use my cheapest speaker for recording. Remember set up is under 100 dolla (guitar not included). It's a Celestion 12, can't remember its name...RockJunior or something. Ported cabinet.

3. Output transformer comes from a single ended radio. It has several primaries (0, 800, 1.6K, 3.2K) Center tap is 1.6K, serious mismatch in resistance, still, I don't pay the hum penalty.


That's all folks.
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Old 7th April 2012, 10:28 PM   #1438
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Originally Posted by jazbo8 View Post
Ah, great men think alike, here is Merlin's version (via AX84):

Click the image to open in full size.

Jaz
That's what first got me started on it. When I first started drawing things up I could not find the link to the picture and just took a few Fender schematics and started from scratch. Ended up being pretty close to Merlin's schematic. What I tried to change was not having the triodes paralleled up in Cathodyne. In this circuit you need an added triode to get the gain back where it should be. I thought you should be able to do it with the two triodes. I posted at AX84 to see if any were still interested in the switched PI thing and had no replies so I went at it on my own.

I am starting on the last circuit I posted, did a half *** board layout on my favorite (strip board), the software I used does not allow to rotate the direction of the strips, not a big deal. This is just the power amp section, I will have to adjust for part size, just gives me a rough guide. Changed some part values, will change some more when it gets up and running. Schematic should not have the grid resistors on the power tubes going to ground, added the fixed bias switch at the last minute and should have deleted the ground. The top strip is the power, the bottom is mainly ground. The black lines are jumpers and a length of holes next to the HV and ground is cut.

Click the image to open in full size.

Last edited by Printer2; 7th April 2012 at 10:35 PM.
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Old 11th April 2012, 11:44 PM   #1439
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Nice to hear a sound clip Cassiel.
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Old 12th April 2012, 01:51 AM   #1440
tubekit is offline tubekit  United States
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Default Happy news. Cool!

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Read post 1403. Hey you're on the list!
Thank you Cassiel.

I sent a letter to Santa Claus.
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