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Old 14th May 2014, 08:43 PM   #11
maton00 is offline maton00  Mexico
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that chasis you discovered were those valves were mounted could carry some hefty power transformers, because those power tubes you mentioned first can dissipate several watts, maybe that chasis is in fact some kind of power amplifier.
Please upload pictures! we can help you out with those tubes
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Old 14th May 2014, 11:39 PM   #12
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Although i am having a great deal of difficulty uploading photos i did eventually clean the chassis enough to find a model number and a builder.
Dukane corp 1a475c mono block amplifier. This link leads to photos of the same model, except that one is a million times less filthy than the one i found.

1A475C Ampl/Mixer DuKane Corporation; St. Charles IL, build
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Old 14th May 2014, 11:56 PM   #13
tomchr is offline tomchr  United States
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Tube datasheets are your friend:

TDSL Tube search

Frank's Electron tube Pages

~Tom
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Old 15th May 2014, 01:34 AM   #14
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That thing has been a real beast, iron is way too big for your current project ( save it for the 200 watt stage amp you'll wana build down the road). may i suggest you read thru the hundred dollar amp challenge.
The Hundred-Buck Amp Challenge.
these were all around 5 watts built as cheap as possible, you may find just what you need.
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Old 15th May 2014, 03:27 AM   #15
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Here is a gallery of some of the stuff:

tubes - Imgur

Mostly for your entertainment. I think that I've progressed through most of my first round of questions and I've been using those datasheets to learn some things. I was happy to discover that 6bg6 is essentially identical to a 6l6, which means that I now have 2 of the 3 tubes used in the model 5f1 champ amp schematic. For the other - haven't figured that part out yet. Wondering if the OD3s can fill the bill.

I have spent a little bit of time in the 100 dollar amp challenge and I'll be returning there as soon as I'm done with this post.
I do have some reason to think that it might not be right for me:
1. When forum members describe the characteristics of their creations I have a hard time understanding. I don't yet have a basis for understanding what they have to say. I think I need to start with smaller steps first.
2. I'm not necessarily limited by that budget. I did say that I wanted to make this very cheap, but unless I'm mistaken most of the people who competed in that thread made some attempt to justify the cost of their parts. For me - I don't care so much. I've got 60-70 tubes of various sizes to choose from and there's no reason for me to pick the cheap parts.

That said - I can see that there's a lot that I still need to learn and I have already learned a few things from that.



Thank you everyone. This seems like a very pleasant community.
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Old 15th May 2014, 03:31 AM   #16
AJT is offline AJT  Philippines
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you can sell some of these tubes for your iron money...
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Old 15th May 2014, 08:54 AM   #17
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I hate to break it to you, but it looks like either one of your 6bg6s or one of your 7867s is dead, judging by the picture (couldn't tell the type from the picture, but something with a plate cap). A tube with a white getter has gone gassy and is of no use. No matter, as these tubes are relatively cheap if you want a replacement. You've still got plenty of good stuff to work with!
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Old 15th May 2014, 08:41 PM   #18
JMFahey is offline JMFahey  Argentina
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Considering you already have a complete amp, although presumably with some issues, the best/fastest/most practical way to go is to first repair it !!!
Plus classic PA amps are KILLER harp and raw guitar sounding amps.
Think White Stripes and their Silvertones and you won't be far from that.
And once it's working you can mod it with Fenderish tone stacks, etc.
Replacing a few resistors and caps with new "same value" in an amp which was already working is by far the shortest path.
Otherwise you'll have to decide on what to build from scratch (besides chassis/iron/sockets), design some layout (form factor won't let you mount a long thin Twin board, for example) , etc.
Of course, clean/vacuum/wipe it well before getting inside
You'll definitely have to replace PSU main caps, the bad tube, etc.
If you find it too much work for a first amp, fine, leave it aside, practice building a Champ or AX84 with other parts (don't cannibalize it ) and in the future return to it.

Last edited by JMFahey; 15th May 2014 at 08:44 PM.
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Old 15th May 2014, 09:19 PM   #19
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Quote:
Originally Posted by JMFahey View Post
Considering you already have a complete amp, although presumably with some issues, the best/fastest/most practical way to go is to first repair it !!!
Plus classic PA amps are KILLER harp and raw guitar sounding amps.
Think White Stripes and their Silvertones and you won't be far from that.
And once it's working you can mod it with Fenderish tone stacks, etc.
Replacing a few resistors and caps with new "same value" in an amp which was already working is by far the shortest path.
Otherwise you'll have to decide on what to build from scratch (besides chassis/iron/sockets), design some layout (form factor won't let you mount a long thin Twin board, for example) , etc.
Of course, clean/vacuum/wipe it well before getting inside
You'll definitely have to replace PSU main caps, the bad tube, etc.
If you find it too much work for a first amp, fine, leave it aside, practice building a Champ or AX84 with other parts (don't cannibalize it ) and in the future return to it.

Yeah i'm trying to leave that intact. 4 of the power tubes - 7867 iirc - were installed in that and had been used. That includes the bad one that i shared a picture of. I wasn't sure why i took that photo tbh but i'm glad i did.

So i think that it would take quite a bit of effort to get that mono amp running again. I would be willing to bet that i'll need 3 more of those tubes and i am skeptical about every capacitor.

I think i have more than enough pieces to put together a champ. I have a champ 600 schematic that uses a solid state bridge instead of the filter tube. I have a 12ax7 and the 6bg6 which supposedly can stand in for a 6v6.

About the iron:
So i have a vast array of transformers to choose from but none have a center tap. They're also specifically 480/240 to 240/120 (for the most part). We have 480 volt busses here at my shop and so we're usually tapping 120 volts for lights and whatnot off of those.

Can i make those work for me? I don't want to have a noisy amp if i can help it.

The good news is that i've got my pick of kva ratings. I've got tons of .050 and ,075s, and some bigger and smaller ones as well. I was thinking i could up my 120 to 480, rectify it and then create a voltage divider to get the specific dc voltages. I've even got some cool resistor bank style resistors that can be tapped in multiple places.
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Old 16th May 2014, 02:11 AM   #20
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The question of iron is moot. There are plenty of transformers that suit my needs but they're pretty heavy. I don't need .075 kva transformers.
I plan to see a builder this weekend about having some of these vacuum tubes tested, so I will also try to barter some tubes for a power transformer as suggested.

I am pleased to have found a full bridge rectifier that'll do nicely. 600 volt. 100 watt rating and it's the size and weight of a checkers piece.
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