Finally finished my first tube amp!

[Jeb-D.]

This is my first completed tube amp. Sounds awsome, I'm very happy with it.





(schematic removed by moderators for safety reasons)

[arnoldc]

Congratulations!

Poor CD player underneath But I guess, any resonance from the player is dead

[bibster]

Contrats!

But why.... why did your brand new amp already end up, upside down in the laundry basket??? (2nd pic)

I like that case! Did you buy/get/found/stole it somewhere, or did you make (or had it made ) yourself?

regards, Paul

[ErikdeBest]

Have you designed the circuit? I see there is no power transformer used That can be fine for you, but actually it is pretty dangerous. A newbee can just look at it and think: "nice, project without power trafo, that will save me some bucks". I would at least put a remark about this issue on the schematic.

[Giaime]

It has no line isolation, very dangerous for the unexperienced.

Please make a correction in your schematic, stating that newbies shouldn't try to build it.

A line isolation transformer doesn't cost much...

[kathodyne]

nice amp....but the household-wire-fitting-strips aren't really on good place in an amp.....i.m.o.

have fun listening to it!!

[tubelab.com]

nice amp....but the household-wire-fitting-strips aren't really on good place in an amp.....i.m.o.

The "euro - style" barrier strips, as they are often called in the states actually work pretty well as no solder terminal strips. The ones sold here at Radio Shack are rated to 450 volts. I have cranked 550 volts through them without issue, and the nylon dielectric material should have no loss at audio frequencies. They should work as well as any other solderless connector. I have an 80 watt push pull breadboard amp that is entirely assembled on these connectors, and it works well.

The no line isolation part is what scares me. A miswired electrical outlet could put the line voltage on the case of your CD player!

[Alain Dupont]

Jeb-D.

Very Good Job

Could you give us details about the OPT's
And what is the Direct AC current ?
Plus the B+ on the 6C33C-B and Plate current ?

Regards.

Alain.

[SY]

This is a total death trap. DO NOT BUILD ANYTHING LIKE THIS CIRCUIT!

[ErikdeBest]

I have to agree with tubelab. I am now in the tube diy for about 3 years, shown by my date of registration at diyaudio. After building some amplifiers and noting that after one week I started asking myself if it could be done better I started thinking about ways to make prototyping easier. I have spent the last year on that, thinking about an easy but reliable way of prototyping tube circuits. I finally came up with some building blocks that allows the combination of different tubes in different circuits. I don't have a digital camera, so I can't post pictures, but as soon as I get one I will do so.

I am using the euro-style terminal strips. Mine are also rated 450V and I think that it is actually no problem to go to 550V. I assume this based on the fact that 450V is the rating for use with high currents. Also, I have got two kinds of connectors. The first have a 10mm spacing between the copper 'tubes', the second have about 7mm...but are also rated 450V... higher spacing = higher insulation!

Erik

(I once sent some earliers version pictures to tubelab, but probably he has thrown them away - and I changed my PC)