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morelius 24th April 2013 10:34 PM

breadboard for tubes
This is my fist post in this forum. I'm new the tube and i want make a breadboard for learn. can you recommend me a system of protoboard?

Thanks for all information and answers

Astera 25th April 2013 01:29 AM

I'm not aware of one. I've built my own bread-board like components though.

Printer2 25th April 2013 01:40 AM

Something like this? that high voltage potential points are separated by 2 or 3 rows. I also use a metal plate under the the plywood that I ground, gets rid of most of the hum.

Tubelab_com 25th April 2013 02:12 AM

I have made several different breadboarding systems over the years. Two are shown in the link. They both require considerable bench space, which limits their use in my smapp lab.

The Tubelab

TheGimp 25th April 2013 03:58 AM

I built the second version in the tubelab link, with the plastic perfboard and will attest to it taking up room.

But, it's nice.

Astera 25th April 2013 05:01 AM

Yeah, mine look a little like the Tubelab set-up ... with Fahnestock clips.

I made them little modules, but the more I've used it, the more I realize there are not too many amp topologies. You could almost lay out a SE or PP amp with Fahnestock clips for the various caps (coupling, etc.) and resistors (grid, etc.) that hang around.

avincenty 25th April 2013 05:15 AM

1 Attachment(s)
This is the first thing i built to start learning about tubes.

Dagwood 25th April 2013 07:20 AM

Nice lab Avincenty, can you share more detail and pics?


ErikdeBest 25th April 2013 09:29 AM

Over the last years I worked on a 'tweaker friendly amplifier'. Besides prototyping (allowing easy exchange of smaller and larger components) I was looking for a system that can also work quite well and safely after prototyping/tweaking is done (so one doesn't need a prototyped amp on a 1D breadboard to a final chassis). I like working with hybrids or sand assisted PS, so I included large L profiles that act as side panels as well as heatsinks, and more heatsinks can be added to the top op the amp if needed.

Meanwhile I had a lot of new ideas, but will have to wait until I am back from Maputo, Mozambique to test them out.

The thread

avincenty 25th April 2013 01:19 PM

1 Attachment(s)

Originally Posted by Dagwood (
Nice lab Avincenty, can you share more detail and pics?


I dont have details of the build. The 4 meters are: 1 250ma, 1 200v and 2 500v. I put these since a few of my HV supplies do not have built in metering. 1/2 of the 9 pin sockets have share the same heater voltage. The 8 pins and the other 1/2 of the 9 pins share another.

Initially i labled the 9 pins for the 12ax7 pinout. I later numbered the jacks so i could use any other pinout.

I added another breadboard for flexibility, i also use it to test solid state stuff.

I also purchased from craigslist a HK A300 and thoroughly went through it with voltmeters and oscilloscope. Learned a lot doing it.

Very important was obtaining the power supplies. Luckily i was living in LA at the time and found vintage gear for 20 a pop.

From there i tested A PP configuration and played with tone controls. My first build soon after that is the larger tube amp in the middle shelf. The HK A300 is below.

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