SE45 schematic monoblock to stereo help - diyAudio
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Old 28th May 2014, 02:44 PM   #1
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Default SE45 schematic monoblock to stereo help

Having looked at so many schematics and talking with folks here i have come to the conclusion to try this circuit. I have not done point to point before but am very confident soldering (having built many patch bays and soldered on PCB's).

What I need help with is to add in a potentiometer and make this thing stereo instead of monoblock. I know its a large thing to ask but you real tube guys could probably show me where to run things.

Tucker 45.jpg
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Old 28th May 2014, 04:39 PM   #2
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Hi,
you have forgotten to add this link: www.positive-feedback.com/issue1/single.htm
Now people can see what you are talking about.
R1 is 249K, so a 250K stereo pot will do it. It works with the mono psu. But you can add a RC for each channel, after C2 for better stereo separation. You need real high eff. speakers for this 1.6 watt amp.
Johann
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Old 28th May 2014, 05:13 PM   #3
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Thanks for a quick reply. I have 97db/m efficient speakers that my Decware Zen drives nicely with only 1.8W at max.

The RC values I wouldn't be able to guess at.

Wouldn't the power tranny need to be twice as powerful?
I'm a picture guy so I need to see how the power supply will look drawn in stereo from the rectifier onward.
I will use a 5R4 for rectification.

Any comments about the CCS? Chip options?
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Old 29th May 2014, 09:38 AM   #4
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I'll send you a pm.
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Old 29th May 2014, 09:44 AM   #5
nl3prc is online now nl3prc  Netherlands
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I don't see in the schematic the tube's that are used.

I the past i came up with something like this.

For ECL82 3W amp and the ECC83 and EL84 for the 6W amp

Tube_power_amp_3w_ECL82-J.zip
Tube_power_amp_6w_EL84-c.zip
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File Type: jpg Tube_power_amp_3w_ECL82-J.JPG (253.3 KB, 187 views)
File Type: jpg Tube_power_amp_6w_EL84-c.JPG (127.1 KB, 174 views)

Last edited by nl3prc; 29th May 2014 at 10:11 AM.
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Old 29th May 2014, 01:10 PM   #6
debk is offline debk  United States
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The tubes are a 5965 and a 45

There is a parts list on the next page of that issue of Valve, October 1997
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Old 30th May 2014, 09:57 AM   #7
nl3prc is online now nl3prc  Netherlands
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Quote:
Originally Posted by Lauscher View Post
Hi,
you have forgotten to add this link: www.positive-feedback.com/issue1/single.htm
Now people can see what you are talking about.
R1 is 249K, so a 250K stereo pot will do it. It works with the mono psu. But you can add a RC for each channel, after C2 for better stereo separation. You need real high eff. speakers for this 1.6 watt amp.
Johann
Problem here is that i can't open the link you posted
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Old 30th May 2014, 12:37 PM   #8
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Hi,
sorry, it does'nt open. Add http/ in front of the link, or go to positive-feedback.com, go to archive, issue 1, at diy you will find it.
Johann
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Old 30th May 2014, 06:12 PM   #9
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Perhaps I'm biting off more than I can chew. Perhaps a community build is where I'm going. I am Ok with low power and will stick with 45 ' because I have 14 of them. I wanted to build an integrated that will accept 2V input. I have to sit down and draw out the whole schematic and add in the changes mention in the article and by Bill Epstein himself...I'm not good at that
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Old 30th May 2014, 10:01 PM   #10
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Check out the article at:
dagogo.com/the-simple-45
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