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Old 15th January 2011, 08:11 AM   #771
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Wich value the Tx in volts for secundary & Va of power for B+
Wich value for plate choke 200H?
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Old 15th January 2011, 08:24 AM   #772
vgeorge is online now vgeorge  Greece
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200 H at 5-10mA for plate choke should be fine. I am using LL1667 25mA now, but I will replace it with a LL1660 5mA soon.
Transformer, it's up to you to calculate, depending your plan.
I am using choke input, so with my 310-0-310 150VA I get 225V before the regulators. It also depends on the rectifier tube you are going to use. If you are going with cap input you will need a smaller trafo.
Try to use PSUD2. It will help to simulate the various senarios.
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Old 15th January 2011, 10:37 AM   #773
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LL1660 is an interstage / line output tx not a choke?

About power/voltage needed for tx I will use this psu
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Old 15th January 2011, 01:34 PM   #774
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Quote:
Originally Posted by merlin el mago View Post
vgeorge,

thanks for support, I have a lot of questions without answer:

Tx for B+, value in volts & power needed to adjust 150V, wich current to use only one SSHV?
Tx for Rod Coleman heater filament, value in volts & power needed or better shoul I ask to Rod?
Sorry my ignorance, cathode bias is a resistor or a resistor bypassed with a cap, values?
It's absolutely mandatory the Tx in a separate box?

Cheers,
Felipe
Hi Felipe, Click on my name to send some PM. Send me an email address, and I can send some PDF manuals. These have all the infos on how to choose transformer, heatsink, and other parts to make good-sounding filament heater, with no hummm!

For 26 DHT, choose 6.0V or 6.3V transformer, 25 .. 30VA
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Old 15th January 2011, 02:13 PM   #775
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Quote:
Originally Posted by Rod Coleman View Post
Hi Felipe, Click on my name to send some PM. Send me an email address, and I can send some PDF manuals. These have all the infos on how to choose transformer, heatsink, and other parts to make good-sounding filament heater, with no hummm!

For 26 DHT, choose 6.0V or 6.3V transformer, 25 .. 30VA
Hi Rod,

PM sent.

Thank you

Felipe
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Old 15th January 2011, 03:13 PM   #776
vgeorge is online now vgeorge  Greece
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Quote:
Originally Posted by merlin el mago View Post
LL1660 is an interstage / line output tx not a choke?

About power/voltage needed for tx I will use this psu
You can use an output transformer, provided it has enough inductance for the tube you will use. It will help me to reduce gain and output impedance also. You can find more info in this thread if you search.
If you use a ss bridge, you can get away with a 0-150V and 100VA transformer. I prefer tube rectification.
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Old 16th January 2011, 09:51 AM   #777
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I need schematic for psu with AZ1 rectified & last updated 26 preamp schematic?
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Old 16th January 2011, 03:57 PM   #778
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Quote:
Originally Posted by merlin el mago View Post
I need schematic for psu with AZ1 rectified & last updated 26 preamp schematic?
This one be OK
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File Type: gif 26 preamp psu AZ1 schematic.gif (3.8 KB, 476 views)
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Old 17th January 2011, 11:40 AM   #779
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I don't see at the datasheet of the LL1660 how to connect for 200H 5mA, I will need one or two chokes?

It's possible to use only one SSHV for 2 tubes, if yes how much current & voltage I need to setup the SSHV?
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Old 17th January 2011, 12:11 PM   #780
vgeorge is online now vgeorge  Greece
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One choke per channel, connection altQ and you have to use the ll1660PP for 5mA. For more than this go to the 1660 10mA SE.
Around 35mA should be fine for SSHV. B+ from 130 to 160V depending on the bias you are going to choose.
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