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Old 15th February 2009, 04:02 PM   #51
rkevans is offline rkevans  United States
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Bringing this old thread back from the dead because I picked up a handful of 6GF7(A) and 6LR8 tubes at a ham fest yesterday.

"Subscribed".

Rick
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Old 16th February 2009, 02:47 PM   #52
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Quote:
I picked up a handful of 6GF7(A) and 6LR8 tubes at a ham fest yesterday.
Did you see the big box full of tubes with the sign that said:

"Free Tubes, be a ham and take a couple, don't be a pig and take them all."

I found a 6GF7 and a 6EM7 in that box. I also found a few big sweep tubes at the "every tube is $3" table. Stan has at least one medium size sweep tube in his $1 list. I don't have the number here at work, but I got some to "test".

I did the prototype PC board about the same time that I did the Simple P-P PC board. The email about the Simple P-P was about 10 times as much as the spud board, so the Simple P-P board has been sent out to the board shop. Once I get the instruction manual written (I can't take the pictures until I have the boards) I will another board. The spud board didn't seem to create much attention, and the universal driver board is already generating email. It doesn't even exist yet.

The spud amp is pretty simple, it could be built with point to point wiring, or even.......clip leads (just kidding).
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Old 16th February 2009, 03:29 PM   #53
rkevans is offline rkevans  United States
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By the time I saw the box of 'take a few' tubes, it was down to about 20 tubes and I didn't recognize anything.

The 'everything is $3' table was a goldmine. A very pretty 5Z4, half a dozen NOS 12AT7, two pairs of 6GF7(a) from matching manuf., two matching pairs of 6LR8, etc. I even left a few tubes behind because I started feeling greedy...

I skipped Stan and the other Orlando tube dealer. I figured they'd still be here after the hamfest. My last vendor was shocked, simply shocked that anyone would buy (metal) 6L6 tubes, so I took all four of them for $5 ea along with a matched pair of used 6L6GC (more than $5), a small collection of tube rectifiers and some $6 JAN Philips 12AT7 parts. I suppose I'll have to build my second S SE board with a lower B+ voltage to make a home for the lower dissipation tubes (or some Russian 6p3s-e tubes, or 6V6, or ... )

I fully understand the board priority situation. I'm already considering the idea of building a single channel via p2p from the discussion in this thread. Even I wasn't very curious about the Spud board before I found a few tubes that would fit it... I think it's a commercially dead product without a better/known supply of appropriate parts.

Overall, it was a fun afternoon. I didn't even glance at any ham radio items. I think I'll still renew my license this year because everyrone I meet is instantly impressed to meet a real Am Extra.

Rick
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Old 16th February 2009, 05:12 PM   #54
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Quote:
By the time I saw the box of 'take a few' tubes, it was down to about 20 tubes and I didn't recognize anything.
I found that one about 3 PM on Friday. The box was nearly full. I always do a hamfest backwards. I got there at 1:30 on Friday, went to the back of the tailgate area and started making a quick pass towards the front, looking for obvious goodies. I check out the back building first and didn't get to the commercial stuff until after dark. I didn't look at radio stuff until Saturday.

Quote:
I skipped Stan and the other Orlando tube dealer. I figured they'd still be here after the hamfest.
I stopped at Stans place on the way to the hamfest to drop off a truckload of tubes. I dropped off my shopping list and he brought the tubes and sockets to the hamfest on Saturday.

Quote:
Even I wasn't very curious about the Spud board before I found a few tubes that would fit it... I think it's a commercially dead product without a better/known supply of appropriate parts.
I was thinking that the only way it would work was to offer a complete kit, and it would need to be price competitive with some of the other cheap amp kits out there. Once Sherri gets back we may revisit the idea of offering parts kits.

Quote:
The 'everything is $3' table was a goldmine.
I didn't stop to really check out all of the tubes she had until Saturday. There were some good tubes there that I can get cheaper from Stan. An example is the 6LU8. It is the same tube as a 6LR8 except in a 12 pin base. Stan has them on the $1 list. Other goodies on his $1 list, the 6EZ5 is an octal sweep tube similar to the 6W6, works in a Simple SE with a lower supply voltage. The 6GV5 is the $1 sweep tube whose number I couldn't remember. Don't know what it will do, but for $1 I'm going to find out.

Quote:
I didn't even glance at any ham radio items. I think I'll still renew my license this year
I got a tech plus license about 25 years ago. I lost a battle with the local code enforcement nazis over my antennas, and lost interest about 20 years ago. I renewed my license twice just in case I ever wanted to tinker with radios again.

I am thinking about designing a ham SDR so I upgraded to an Extra and purchased a multi band wire antenna. I design two way radio equipment for a living, so I might cook up something cool if I ever find time for it.
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Old 16th February 2009, 05:43 PM   #55
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Finally Britain did something right, so I now have a 'Full' license for life. There only was one technical grade when I did it, that was 'damn difficult'. I mean, you're about to embark on Her Majesty's Airwaves, old boy. What!

They got rid of the morse requirement, too.

w

Citizen's Band? The cheek of it. Next thing they'll all want communicators like Star Trek.

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Old 16th February 2009, 06:39 PM   #56
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Quote:
Originally posted by tubelab.com
The spud amp is pretty simple, it could be built with point to point wiring
Picked up some more parts this week for my 6LU8 project. I really like the 6BY5GA rr tubes I got for the PS.

Jeff
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Old 6th April 2009, 12:08 PM   #57
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George-
Any progress on releasing a schematic, or a board?? Maybe I should build the simple SE I have first..... already have the feelers out for the next project!
Lee
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Old 6th April 2009, 02:16 PM   #58
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I made the first prototype for this amp almost a year ago. It was about the same time that I did the prototype for the Simple P-P. The Spud SE generated about 5 emails while the Simple P-P overflowed my in basket. The Simple P-P boards should be in house in about 2 weeks. I will then be busy writing the assembly manual.

Interestingly I got more email requesting a bigger Simple P-P than I got about the Spud SE, although interest in the Spud amp has picked up in recent weeks. I will get back to it as time permits, but I can't say when right now with all of the stuff going on in my life right now.

I have the Eagle schematic, and I can post it but there are no component values on it. I put the board in a safe place, so when I remember where that safe place is I can find out what parts are actually on the board.

Notice. Diodes D7 and D8 are only used if a full wave NON _CT power transformer is used. They are not needed with the typical power transformer.
Attached Files
File Type: pdf spud_1.pdf (43.7 KB, 309 views)
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Old 9th April 2009, 08:32 PM   #59
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George,

I wanted you to know that I would love to see you finish the development of your Spud Board. Been watching for a long time.

Alan
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Old 9th April 2009, 08:45 PM   #60
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George,
I also am interested in the "spud". My wife could use a nice tube amp at work and this one fits the bill. Having previous Tubelab build experience I know the quality will be good.

Dan
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