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Old 24th September 2008, 08:43 PM   #31
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The 150mA is a little extra. With all 6n1p's you'll probably be closer to a total current draw of 30-40mA or so. (7-10mA per tube)

B+ is the power supply voltage. It comes from the old b for battery. Batteries were some of the first power supplies used with tubes.

The anode voltage is Va. It is the voltage across the anode measured from the cathode.

As you may or may not know between the b+ and the anode there often is a load in most driver stages.

This load is often a resistor but can also be choke/transformer or ccs.

So often from b+ -> resistor -> anode. If the tube is drawing a current is a voltage will develop across the resistor. In other words b+ is often much higher than Va.
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Old 24th September 2008, 08:45 PM   #32
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Here is an excellent primer to brush up on your tube electronics
http://www.basenjes.de/tubes/data/neets_ch6.pdf

PS...this is not to prevent you from asking questions...but something you could download and peruse every now and then...in between c# courses
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Old 24th September 2008, 09:09 PM   #33
Brit01 is offline Brit01  United Kingdom
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Thanks very much Bas.

Hope I can find some time to read through this.

Also I'm in a bit of a rush to buy parts as my other half will be in USA in 3 weeks.
I need to know what I'm buying so I have the right parts for the psu and Aikido board.
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Old 29th September 2008, 11:30 PM   #34
Brit01 is offline Brit01  United Kingdom
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Hi Bas/Olle,

I've seen this new power board from JB:

http://glass-ware.stores.yahoo.net/hps1.html

Would this match well with the Aikido 9 pin stereo kit?
6.3 V right?



Thanks
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Old 30th September 2008, 12:47 AM   #35
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AFAIK,

you can use that board to give you any voltage upto the limit of the LM317. I use one to give me 25V for my 24V aikido. Yes, you could use it for the heaters - but you're looking at an amp or so total IIRC. The parts might need to be adjusted to give you the correct output range though. I would have thought that something simpler would do for heaters though....

Its a nice board, with facility for cap bypasses on the diodes and nicely built.

Fran

EDIT: I see he says its good for upto 2.5amps!
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Old 30th September 2008, 02:00 PM   #36
Brit01 is offline Brit01  United Kingdom
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Aikido are out of stock for the 9-pin stereo kit.

But they do have the 5687 kit.



Any opinions on this for a newbie?glass-ware.stores.yahoo.net/aiam56stkit.html
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Old 1st October 2008, 04:10 PM   #37
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He will have them back in stock - drop him an email and ask when they will be back in. FWIW, if you buy the 5687 board, it isn't really compatible with other 9 pin types, eg the 6N1P mentioned above. He might have just the boards but not all the other components....


Fran
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Old 1st October 2008, 04:38 PM   #38
Brit01 is offline Brit01  United Kingdom
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Thanks Fran.

I dropped him a personal mail the other day but no reply yet. I tried the sales email just now. Let's see.
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Old 8th October 2008, 10:18 PM   #39
Brit01 is offline Brit01  United Kingdom
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My Aikido kit has been shipped
psu on it's way from Gregg in Canada

I have read something interesting that you may have some advice on as I am using a Carver TFM-55 power amp.

Quote:
Mixing a tube output and a solid state input can be hazardous to the health of the SS input!! The output cap will let a little bit of DC pass as it first powers up. It doesn't take much on the input chip of a SS amp to create conditions in which they can't survive.
Quote:
"I have personally seen many blown amplifiers due to this and have also studied this in my development of directly driving tube stages into transistors in my hybrid amplifier designs."
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Old 8th October 2008, 10:36 PM   #40
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It is something to think about indeed! Thank you for the warning!
I think it can be solved with a mute-switch...

So you will have your boards i a couple of days! Nice
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