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-   -   Tube Amplifier Kit? (http://www.diyaudio.com/forums/tubes-valves/117134-tube-amplifier-kit.html)

theblackknight 9th February 2008 10:24 PM

Tube Amplifier Kit?
 
Hi!

I am looking for a tube amplifier kit, as I really want to built one and get some experience soldering, etc.

I'd prefer that it's a stereo one, and 10-15 wpc is fine.

Can you give me links to anyplaces that might have a kit like this?

I'd like to keep costs under $250.

Thanks!
Henry

Sal Brisindi 9th February 2008 11:35 PM

This amp comes to mind...

http://www.tubeaudio.com/page23.html

Sal Brisindi

tinitus 10th February 2008 12:07 AM

Have you searched the forum...within the last week or so this is the third thread opened about this subject :)

Eli Duttman 10th February 2008 12:30 AM

Henry,

The low cost kit Sal linked is going to come up short on power. IMO, those wood plank and PCB amps are barely better than toys.

May I immodestly suggest you peruse the SAGA of "El Cheapo''. You should be able to get 12 very honest WPC using ultralinear wired O/P tubes and come darn close to that $250 cost. Build with Edcor CXPP25-6-7.6K O/P trafos.

BTW, if a CDP is the source, you don't need a preamp with "El Cheapo". ;)

theblackknight 10th February 2008 05:43 PM

Thanks for the help and esp. the links, guys!!!!

Why isn't the amp that Sal suggested a very good one?

If I bought it, I'd probably buy the glass/metal cage for it just for good measure--so the wood breadboard would be unnessessary.

I have a couple old Pioneer CS-99 speakers that are 80 watts each--they are pretty efficient. would Sal's 8wpc amp drive them OK?

also, I'm using a CDP/tuner as a source. I may use a preamp though.

Overall, I probably wouldn't use it much at all. I just want it to build, as I'd have a ton of fun building it. I don'd want to spend a ton of money (i.e., $400+) on an amp I would build and hardly use. I already have spent over a $1000 on my main amplifiers (S/S) and they are my daily drivers. If I ever wanted a tube amp to use regularily, I would save up and buy an expensive one.

tinitus 10th February 2008 11:17 PM

Is this with mods ?

http://store.triodestore.com/diy35kit.html


But if you cant even solder I am not sure if a tubeamp is the first place to start :bigeyes:

theblackknight 11th February 2008 08:19 PM

that ST-35 is pretty expensive, but I may end up going with it.

I have some experience soldering, and feel OK doing it. I just want to build it mainly for fun.


Is there a possible way to find a schematic and just build the amp out of ebay'ed parts?

planet10 11th February 2008 08:30 PM

Quote:

Originally posted by theblackknight
that ST-35 is pretty expensive, but I may end up going with it.
....Is there a possible way to find a schematic and just build the amp out of ebay'ed parts?
If you are going to go that route you would do much better to do a variation on Eli's El Cheapo.

We did a 4W class A variation with EL84 and it is really an eye opener. This coming WE we will be using it as a refernce to evaluate the sonics of some amps from $1000-$2000 and within its limits i expect it to show up the shortcomings of the commercial kit.

dave

theblackknight 14th February 2008 01:57 AM

that "saga of el cheapo" really sounds intrigueing. I think I will go with it!

I'd like to be able to use EL-84's if possible because I have 2 Mullard EL-84's around here looking for a better amp!

I also have a Mullard 12AX7 that I could use.

I will reread the thread more closely this weekend and see if I can better understand all the "tech talk" in it. Then I will post back with any decisions/questions.

Eli Duttman 14th February 2008 02:51 AM

Quote:

Originally posted by theblackknight
that "saga of el cheapo" really sounds intrigueing. I think I will go with it!

I'd like to be able to use EL-84's if possible because I have 2 Mullard EL-84's around here looking for a better amp!

I also have a Mullard 12AX7 that I could use.

I will reread the thread more closely this weekend and see if I can better understand all the "tech talk" in it. Then I will post back with any decisions/questions.


You need 2X tightly matched power tube pairs (4 tubes total) to build an "El Cheapo".

Even if you had 2X Mullard 12AX7s (1 per channel), the high Rp and low gm makes the type a poor choice for the differential (LTP) splitter/driver used in EC. The 12AT7 was selected for more than 1 good reason.

The tubes you already have might make a nice SE pentode amp. However, 5 WPC is all you get. So, speakers at least 95 dB. efficient are in order. Also, a "flat" impedance curve is necessary.


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