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Old 11th February 2005, 08:53 AM   #1
day is offline day  Thailand
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Default want to build SE450TL

HI
I have 3 of 450TL. can i do SE amp? anybody have circuit
thank you
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Old 11th February 2005, 09:24 AM   #2
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Yes, you can make a single-ended amp with them. Heck, you can make a single ended amp with any amplification device - even a 12AX7 if you felt like it.

You can have a look at the Eimac datasheet on Frank Phillipse's site here. My concern is that the construction of a 450TL amp is non-trivial and involves dangerous voltages - probably several thousand volts
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Old 12th February 2005, 02:32 PM   #3
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Thank you audiousername.you say what several thousand volts It can be several 100.
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Old 12th February 2005, 04:32 PM   #4
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"It can be several 100."

Many several hundred volts. The tube won't perform well at low plate voltage. It won't deliver much output power.
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Old 13th February 2005, 02:56 AM   #5
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By the data sheet 3000-5000 Volts typical... that is scary dangerous.... even someone with a HUGE amount of high voltage experience is going to be scared of that... me i'm turning and running as fast as i can...

even using it as a decorative light bulb it uses 7.5 V at 12 A...

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Old 13th February 2005, 05:34 AM   #6
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Day, believe me. These things need lots of volts to work well. Another thing of note - there don't seem to be normal anode characteristic curves available, so you'll have to derive them from the Eimac constant current characteristics, which is a bit of a pain. Also a pain is providing a 90W filament supply. But nowhere near the pain of being shocked by a several kV power supply!

In the interests of your safety, I would suggest working with something less dangerous - someone with sufficient knowledge to be safe with such high voltages probably would not need to ask how to design a single ended amplifier.
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Old 13th February 2005, 08:09 AM   #7
day is offline day  Thailand
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Uh......Jason....I will stop to do this. how about RCA8121 and eimac JAN-7203 I have several of them
thank you all
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Old 13th February 2005, 08:18 AM   #8
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Quote:
Originally posted by day
how about RCA8121 and eimac JAN-7203 I have several of them
I'm not familiar with these valves. I'll have a look at the datasheets and get back to you.

EDIT: I had a quick look at the datasheets. These are little metal thingies, yes? They basically require forced air cooling and are sort of dangerous too since (I think) that the external radiators are in fact connected to the anode - and are thus at the potential of the HT.
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Old 14th February 2005, 09:06 AM   #9
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OK .....i will fine some tubes and come to ? you again
thank you
this is my amp but i need more power
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Old 14th February 2005, 09:10 AM   #10
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That is a nice lookiing amp

I'll hazard a guess and say - SE 2A3?

Might I suggest trying to get a hold of some RF double tetrodes like 829B, QQV03-20, QQV07-50, YL1071 etc... (the all glass things with prongy anode connectors on top) if you're looking for some nice valves that don't cost the earth.

If you must have single-ended, the problem is that most higher powered amps, say >10W will require very dangerous voltages.
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