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recommendations for a tube amp for small speakers? - Page 2

post #16 of 26
11/17/08 at 6:08am
Thread Starter 
Wow, just put together a preliminary BOM for the midget and the price looks good! However, I am having trouble trying to source the parts for the following labels on the schematic:
2H 70mA inductor
100V diode

I couldn't find the 2H 70mA inductor on mouser or digikey (value seems huge?), and I'm not sure what part would be appropriate for a "100v diode". Any help?
Thanks again for the great suggestions.

For reference:
Pete's website (Mighty Midget)
Audio Xpress Article (Mighty Midget)
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post #17 of 26
11/17/08 at 6:28am
Quote:
Originally Posted by chobint View Post
I couldn't find the 2H 7mA inductor on mouser or digikey (value seems huge?),
Hammond 154M fits the bill, and is available from Mouser.

Quote:
and I'm not sure what part would be appropriate for a "100v diode". Any help?
That's a zener. Try a 1N5378
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post #18 of 26
11/18/08 at 1:29am
What was the final damage for the Mighty Midget, and would you mind sharing the BOM? Just for some sleepy time reading... ;-)
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post #19 of 26
11/18/08 at 9:57pm
Thread Starter 
Ya I'll post it up once I redo it. My comp has been crashing frequently these last few days and I did not get a chance to save my spreadsheet >< So I'll be remaking it here as time permits.
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post #20 of 26
11/18/08 at 10:34pm
I'm interested in what number you come up with for the Midget. I might build one.
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post #21 of 26
11/24/08 at 6:40pm
Thread Starter 
Ok, as promised here is the BOM. There are two blanks tho. I wasn't sure what an appropriate LED (3x per channel) would be, and the 61.9k 1W resistor is a vishay-dale part that is non-stocked at the major vendors. This is the first BOM I've put together from scratch, so please feel free to critique.

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post #22 of 26
11/24/08 at 8:41pm
If you have trouble finding the Vishay Dale resistor in the RN military specification, just use the CMF ones, they are the exact same part, just with commercial labeling and spec's. For example the RN60 is rated at 1/4 watt. The exact same CMF60 can be rated up to 1 watt, depending on the ambient temp. Just check the data sheets before buying.

Note: I always check to make sure the part is "in stock" also. I can't tell you how many times I have placed an order with Mouser only to get an e-mail the next day stating that the back ordered parts will be shipped later. Shipping can add up real fast.
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post #23 of 26
11/24/08 at 9:34pm
Thread Starter 
Edit: Bah nvm. All the suitable items seems nonstocked. It seems I may have to parallel two 124k 1/2W resistors.
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post #24 of 26
11/24/08 at 11:21pm
Give Nebraska Surplus a try - mayhaps they will have some pieces you need. Oh, and you might add tube sockets to the BOM.
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post #25 of 26
11/25/08 at 12:08am
Thread Starter 
Right you are, I'll add it once I find a well priced pair. And thanks for the link, they do appear to have the 61.9k RN70 in stock.

So for the LED's...since they drop 1.8v per, would a 1.8V 20mA LED do the job? or would I want something beefier like 3.6v 20 mA. If I overdo the LED's voltage rating it wont light up right?
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post #26 of 26
11/26/08 at 5:36pm
Thanks! Just got my pair of RCA 6T10s, so I'll have to build one soon.
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