Tubedepot Tweed Champ kit

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 3:35 am

DISCLAIMER - THIS IS MY FIRST AMP.

I just put together a Tubedepot Tweed Champ kit together. On C4 I am supposed to have 22 volts +- 3 volts. I get 55 volts. The amp turns on and works but not very well. At volume 10 of 12 it has a faint pop and the Power tube (6V6) has a slight arcing inside when this noise occurs and the sound drops off significantly at anything higher. All other tests passed.

Any ideas?

Firestorm · Post by **Firestorm** » Fri Aug 30, 2013 4:17 am

We'll need pics of what you built, not the manual. Simple circuit, good choice to start, but you wired something wrong.

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 11:55 am

OK, here are some of the pictures I have.

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 11:57 am

More pictures...

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 11:58 am

...more pictures

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 11:59 am

...more pictures

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 12:01 pm

...yet more...

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 12:04 pm

...even more...

Let me know if you need a better picture of any particular area. These were taken with my phone camera. I can get my real camera out and take more detailed pictures, if needed.

Thanks!

martin manning · Post by **martin manning** » Fri Aug 30, 2013 12:33 pm

Most of these pics are of little value. Get a few high-resolution shots of the wiring, especially around the tube sockets, and in its present state.

labb · Post by **labb** » Fri Aug 30, 2013 12:36 pm

You have over twice the current through the tube as there is suppose to be. Take a look at the wiring around pin 5 and see if you could have DC on pin 5. Tube debot's recommendation and reference to the dim light bulb limiter should be considered. Hope you have a spare 6V6. It has probably failed.

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 1:23 pm

OK, thanks for the input.

Vectorer · Post by **Vectorer** » Fri Aug 30, 2013 1:31 pm

I will take some new hi-res pictures and post tomorrow. I am doing this with my 17 year old as a father-son project and he got discouraged when it did not work right. I see it as the rest of the fun of figuring out what needs to be done to get it to work right. I really appreciate the feedback and inputs.

Thanks!

Structo · Post by **Structo** » Fri Aug 30, 2013 2:47 pm

Good project for father and son.

Double check all component values and placement.

Double check all wiring.

You could just have a defective power tube but you need to check everything first to make sure no mistakes were made.

The New Steve H · Post by **The New Steve H** » Fri Aug 30, 2013 3:23 pm

Vectorer is a buddy of mine. I told him you guys would take good care of him. I will try to clue him in on gut shots and so on.

I am wondering if he has the wrong resistor value beside the cap on the 6V6 cathode. If that's the case, he must have the wrong resistor somewhere else, too!

M Fowler · Post by **M Fowler** » Fri Aug 30, 2013 3:26 pm

You really need to do as Structo said go over each connection and make sure you have wired the circuit correctly. I've built over 50 amps and making a wiring error or incorrect resistor selection is easy to do.

Great project stick with it.

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Tubedepot Tweed Champ kit

Tubedepot Tweed Champ kit

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