2w Sub Miniature Express
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2w Sub Miniature Express
I am kind of caught up on builds at the moment and had some free time to play with some new ideas. A Local friend turned me onto a few of the Subminiature tubes and I though I would see what I could make with them. I decided to see if I couldn't build a miniature bedroom amp. The idea then evolved into putting a complete Express on a small PCB board that measures 4" x 8" (Less power supply) I came up with the design on the board and ectched up a prototype to test the amp with . This test board is single sided and will have jumpers for the top copper side. I will have some professional boards made up if the thing sounds worth persueing. I know there has been some use of the 6112 preamp tubes in Wrecks before but I am also using the Sub mini 5902 beam power pentode tubes in a PP configuration. The pots are all 1/4w. I'll try and keep this thread updated if anyone is interested. I am calling this one the Lil' Devil
Here are a few pics of the prototype board with all the parts installed (Minus the top Jumpers). All resistors are 1/2w except for the 1w screen resistors and the 1k3w that replaced the 25w. I included a pic of my Ipod Nano next to the board to give you an idea of the size.
Here are a few pics of the prototype board with all the parts installed (Minus the top Jumpers). All resistors are 1/2w except for the 1w screen resistors and the 1k3w that replaced the 25w. I included a pic of my Ipod Nano next to the board to give you an idea of the size.
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Last edited by UR12 on Sun Aug 03, 2008 3:44 pm, edited 1 time in total.
Re: 2w Sub Miniature Express
that is about the coolest thing i have seen in a while ,how do you think this stuff up? can't wait to see and hear the final product.
- VacuumVoodoo
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Re: 2w Sub Miniature Express
Spring loaded 8 pin DIL sockets for tubes. Cool.
Aleksander Niemand
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Life's a party but you get invited only once...
affiliation:TUBEWONDER AMPS
Zagray!-review
Re: 2w Sub Miniature Express
Thanks! I guess I just have a warped mind I can't wait to hear it eitherbigmik wrote:that is about the coolest thing i have seen in a while ,how do you think this stuff up? can't wait to see and hear the final product.
Yes, In the true spirit of Ken Fisher I decided to to use what I had laying around. They fit the bill so I went with it. If they cause me any trouble I will either solder them to a 8 pin dip header and plup them into the sockets that way or just solder them directly to the board without sockets the way they were intended to be installed.VacuumVoodoo wrote:Spring loaded 8 pin DIL sockets for tubes. Cool.
Re: 2w Sub Miniature Express
Keep us up on this here Lil' Devil Dana...
Most interesting!
Most interesting!
Re: 2w Sub Miniature Express
WAY KEWL, Dana!
Did you put our regular Express in the washing machine and hit the wrong temperature button?
Like small amps!
Wonder how she sounds like. My Lil'Wreck uses on 12AX7/ECC83 and half of 12AU7/ECC82 as SE output and quite low voltages <170V. It's nice, but triodes are not pentodes nor do they sound exactly like 'em.
Ciao
Martin
Did you put our regular Express in the washing machine and hit the wrong temperature button?
Like small amps!
Wonder how she sounds like. My Lil'Wreck uses on 12AX7/ECC83 and half of 12AU7/ECC82 as SE output and quite low voltages <170V. It's nice, but triodes are not pentodes nor do they sound exactly like 'em.
Ciao
Martin
Re: 2w Sub Miniature Express
Oh my word, you are indeed a tubehead SuuuperGenius!
Keep posting, this is just sooooo cool.
Keep posting, this is just sooooo cool.
Re: 2w Sub Miniature Express
I just ordered trannys so I guess they will be in next wednesday. At that rate I should have it fired up one day next week. I went with Hammond off the shelf trannys to start with a 129ax for power and a 125a for the OT. I'll be running the outputs at either 5.6k or 6.8k.
I am looking for a good 5 or 6 inch guitar speaker. If anyone has any suggestions I would love to hear them.
I am looking for a good 5 or 6 inch guitar speaker. If anyone has any suggestions I would love to hear them.
- thousandshirts
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Re: 2w Sub Miniature Express
This could be a really fun amp to play. I'll be reading closely. Thanks for sharing!
Regarding your words about speakers, I know Weber offers two 6" speakers, one ceramic ($30), and one alnico ($45), for use in the small, early Fender type amps. 15 watts each, and the alnico has three different cone options.
https://taweber.powweb.com/weber/asig6.htm - Alnico
https://taweber.powweb.com/weber/csig6.htm - Ceramic
Regarding your words about speakers, I know Weber offers two 6" speakers, one ceramic ($30), and one alnico ($45), for use in the small, early Fender type amps. 15 watts each, and the alnico has three different cone options.
https://taweber.powweb.com/weber/asig6.htm - Alnico
https://taweber.powweb.com/weber/csig6.htm - Ceramic
- Lonely Raven
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Re: 2w Sub Miniature Express
Dibs on one when you have one to sell, Dana!!
Jack of all Trades,
Master of None
Master of None
Re: 2w Sub Miniature Express
Were is the VVR???? LOL
Interesting.
Gary
Interesting.
Gary
- Lonely Raven
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Re: 2w Sub Miniature Express
VVR? For that thing, he'll have to start working on a Turbo!
Jack of all Trades,
Master of None
Master of None
Re: 2w Sub Miniature Express
Wonder what PP cascode output would sound like. Anyone ever try it? Would it be a pain in the ass?El_Martin wrote:...triodes are not pentodes nor do they sound exactly like 'em.
W
Re: 2w Sub Miniature Express
Wayne, it takes an equally warped tube mind to think of that.
While dabbling w. my Lil'Wreck I thought a second about it...why not try? Nothing to lose.
Ciao
Martin
While dabbling w. my Lil'Wreck I thought a second about it...why not try? Nothing to lose.
Ciao
Martin
Re: 2w Sub Miniature Express
Well, if you've got a platform you can easily try it on, do keep us informed. I've got something else on the go right now, and a lot of other drama going on as well, so I can't really try it right away.
Hopefully, it would come closer to the pentode sound. I can't say I've ever heard triode output sound that I liked (does "triode mode" on a pentode amp even count for this?), and I don't know of a small pentode that's in new production/readily available except the EF86 - haven't read too much good about those..
W
Hopefully, it would come closer to the pentode sound. I can't say I've ever heard triode output sound that I liked (does "triode mode" on a pentode amp even count for this?), and I don't know of a small pentode that's in new production/readily available except the EF86 - haven't read too much good about those..
W