Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Tone Junkie on March 17, 2011, 11:39:41 pm

Title: Woo hoo frankenstien roared
Post by: Tone Junkie on March 17, 2011, 11:39:41 pm

Well at least one half anyway been working on kind of a high gain beast two channel.
 channel 1 = 2203 with a switchable extra gain stage, channel 2 a modified slo lead channel. channel one was easy I only had to find the ground i missed . I dont know why I always miss one. channel 2 was giving me fits untill I traced it to my third pre amp tube that wasnt working had me baffled for a few, of course after the old lady went to bed I found a bad solder joint on one of the heater wires .
Cant wait for tomorrow to fire her up. Oh did I say kt66 for output tubes on a marshall type power amp section should be interesting.                       :guitar1 :happy1: :happy2: :occasion14:

Thanks Bill

Title: Re: Woo hoo frankenstien roared
Post by: jerrydyer on March 18, 2011, 11:07:22 am

sweet! sounds like you like what I like.

Title: Re: Woo hoo frankenstien roared
Post by: jojokeo on March 18, 2011, 12:41:04 pm

Quote from: Tone Junkie on March 17, 2011, 11:39:41 pm

I found a bad solder joint on one of the heater wires .

That happened to me once so afterwards on all new builds I will always check votages before installing tubes. Once all heaters and B+ is checked I install the tubes and put it on a current limiter (light builb in series), plug into the input w/ a DIY signal generator and hook up a speaker motor. The speaker motor is simply the magnet, coil, & spider innerds I save from cutting the frame & cone away from any old warped frame or damaged cone speaker. I will still get tone from what's left, enough to test stuff with like this. I will check B+ voltages again and then flip the switch on my current limiter giving full power to the amp. Then it's voltage reading time again for all B+ nodes, and doing a Pdiss calculation to see where I'm at there too. After all this, it's time to start pickin' and grinnin'  :m8

Title: Re: Woo hoo frankenstien roared
Post by: DummyLoad on March 18, 2011, 04:08:55 pm

pics?

 :icon_biggrin:

--DL

Title: Re: Woo hoo frankenstien roared
Post by: Tone Junkie on March 19, 2011, 04:26:47 pm

I had checked all voltages and all of them were exactly were I thought they should be but when the tube was in it wouldnt work was very strange so shut her of drained caps and started wiggling felt like a dork having a bad solder in such a basic area. Thanks Bill
Shes kind of tight as you can tell  :guitar1

Title: Re: Woo hoo frankenstien roared
Post by: Tone Junkie on March 19, 2011, 04:29:26 pm

wouldnt let me put both pictures on same one.

Title: Re: Woo hoo frankenstien roared
Post by: DummyLoad on March 19, 2011, 08:05:23 pm

nice build bill...

 :icon_biggrin:

Title: Re: Woo hoo frankenstien roared
Post by: stingray_65 on March 20, 2011, 12:36:27 am

Real PURDY!

Curious, what's your take on those Mag Comp trannies, The Marshall-esque ones like you have.

I build mostly Fender based amps and love their (Mag Comp) sound and reliably, but those are Black and yours are Silver

Ray

Title: Re: Woo hoo frankenstien roared
Post by: Tone Junkie on March 20, 2011, 01:17:15 am

I like em high quality good price, first time I have used a kt66 tube, man I like the sound of these.
 I got some miner oscillation to figure out its only noticable with the sound turned off the guitar on the slo lead channel I will pin it down just got to do the work. but when the volume is on this thing is smokin.
Bill    :guitar1 :headbang: :happy1: