The Hundred-Buck Amp Challenge - Page 13 - diyAudio
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Old 16th June 2011, 02:14 AM   #121
Cassiel is online now Cassiel  Libya
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as long as the parts are available enough to be "legal"
My OPT comes from a 60's Reel to Reel player. How legal is that? LOL. Output tube was an ECL86. It looks too small for 4W though. I thought about using a transformer cover to cheat the grand jury. Bah. Not worth the trouble. What I'm not going to do is to buy a crappy transformer that I don't need. My other parts are legal - bummer.

Anyway, I'm going to be busy building an F5. Probably I will also build my little guitar amp just to compare it with the work of others. I wish all of the other participants the best of luck. My vote will be fair - no hard feelings.
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Old 16th June 2011, 02:27 AM   #122
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Hey, how did it sound after the mod? Did the amp do justice to the cab? Do you remember the Peavey model and the replacement chip?
I don't remember too much, it was about 15 years ago. I was surprised to find out just how few parts were inside the amp. It was a little practice amp about a foot tall, maybe 8 watts. The chip was cratered and I didn't really know what it was. At the time we had chip company reps visiting us daily trying to sell us chips. I work for Motorola, designing cell phones at the time. I got a hand full of everything National Semiconductor made with the right pinout, and tried the biggest one (TDA2030 maybe). It worked and the kid never blew it up again. He lived next door and played in a death metal band. The Peavey was for when his parents were home. It sounded far better than my daughters Gorilla. He had a full stack for the band. Don't remember what kind, but it wasn't a popular brand. I never heard the Peavey through the big speakers.

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You must have been very popular with the teachers!
I was in a 3 year long vocational high school electronics program back in 1967-1970. It was 3 hours / day for the last 2 years. There were two of us students that did all sorts of stuff, and our teacher was really cool about it. I think he liked learning just what would happen when you turned the knob to the right as much as we did. We had no budget, but we got donations from all over so the donor got a tax write off. We got tons of stuff from Homestead Air Force base, including hundreds of metal 6L6's. Yes, I can make a metal tube glow red! Where do you think I learned how to melt tubes.

I just remembered that I have a dead Park (Marshall) 100 watt head in my warehouse. I guess I'll have to fix it to test some speakers. Lets see 100 watt Marshall, 15 watt speaker..........
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Old 16th June 2011, 02:37 AM   #123
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I wish all of the other participants the best of luck. My vote will be fair - no hard feelings.
Win or not, it doesn't matter to me. Its about time I took a crash course in guitar amp building. I used to make a lot of them, but that was at least 15 years ago. I fixed a few while my daughter lived at home, and the metal head lived next door. Most of the guitar players and ALL of the tube heads were taken out when they laid off 355 people in one day at work. It seems that all the fun, just died on that day, now its just a job.

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What I'm not going to do is to buy a crappy transformer that I don't need. My other parts are legal - bummer.
So weigh it, measure the impedance, and find a similar transformer that can be bought somewhere and use that price. From BST's post:

The idea of using junkbox parts, or parts already on hand, and then tallying the equivalent current purchase price, is an excellent suggestion. I didn't realize that there were many prospective builders who have a problem with slow parts deliveries.
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Old 16th June 2011, 02:45 AM   #124
TheGimp is offline TheGimp  United States
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I'd like to make a proposal with regards to demonstrating the amps.

Although many of us are musically gifted, there are those of us who's greatest musical skill might be tuning an FM station (myself included).

It would be nice (helpful to some of us) if some of the more gifted would produce a wave file or other of the output of their guitar (buffered only) which could be used as the input of an amp for demonstration purposes.

If several people with different styles (Clean Lead, Heavy metal, Blues, etc) would do this, it would be possible to do more of an apples to apples comparison.

If enough people would do this, a demo cd could be made to show off the strengths and weaknesses of the designs.
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Old 16th June 2011, 02:48 AM   #125
Trout is offline Trout  United States
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Originally Posted by Printer2 View Post
OUTPUT TRANSFORMERS: FENDER CHAMP STYLE 5W OUTPUT TRANSFORMER TF103-48 Single Ended Ultra-Linear 4 / 8 Ohm MADE IN USA $19.95

Shipping to North Dakota
$11.95
Shipping to Canada (across the border) $32.95
Resistors can be bought in town here in packs of four, $1.99 (1/2 - 1W), not sure how much shipping I should tack on.
In Canada I would likely be looking at Just Radio's (Canadian Vendor) for things like Caps, Resistors & much lower localized shipping expense.

Also, that particular transformer is made in Chicago, there might very well be a Canadian vendor that sells them for less.
Check some of the guitar amp parts websites.
That is a Magnetic Components Inc. Product, they market the Classictone series of transformers that are getting very popular.
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Old 16th June 2011, 03:03 AM   #126
Cassiel is online now Cassiel  Libya
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The idea of using junkbox parts, or parts already on hand, and then tallying the equivalent current purchase price, is an excellent suggestion.
Yeah, I read that. I also read what he wrote today. He'd changed his tune. Parts should be available to everyone. I have no problem with the rules, but I have several vintage OPT's good for the job... why buy another one? To win? Makes no sense to me.

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Win or not, it doesn't matter to me.
I know that. I know you love experimenting and this is going to be fun. OK, I will post my project but it will be out of contest. Just for educating purposes.
As I said before, I respect the rules.
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Old 16th June 2011, 03:44 AM   #127
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Originally Posted by Trout View Post
In Canada I would likely be looking at Just Radio's (Canadian Vendor) for things like Caps, Resistors & much lower localized shipping expense.

Also, that particular transformer is made in Chicago, there might very well be a Canadian vendor that sells them for less.
Check some of the guitar amp parts websites.
That is a Magnetic Components Inc. Product, they market the Classictone series of transformers that are getting very popular.
Just using them as an example. I probably have most of what I need to get me going, might bring in one special order transformer at the local parts shop at the retail price. I'll look up Just Radio's, thanks.
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Old 16th June 2011, 05:43 AM   #128
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Originally Posted by ChrisA View Post
I have a 12" Emanance "Legend". It is about 100dB and it sounds good with my 10W amp that I never turn up loud. The amp is a single ended EL84. I built it as a combo with a Jenson Mod 8 inch inside. The 8" mod sounds good but the Legend sound much nicer especially when clean.

I also have one of those $148 Fender champ 600 amps that is 6V6 powered and the Legend sounds better than the built-in Fender speaker

I paid about $100 for the Legend. So it does not really work with the spirit of this contest. for this contest Mod is good but also look at having Weber build a small custom speaker.
ChrisA, the rules apparently do not address speakers, so I see no reason not to use the speaker that shows off the amp the best. If a 12" Legend makes your amp sound great, go for it, IMO. The idea is still good sound, after all. As TubeLab pointed out, there will be a practical limit to size, but if a 12" Eminence works, do it. You'll probably need the whole 5 watts, of course...

Quote:
the Legend sounds better than the built-in Fender speaker
I'm shocked, shocked, I say.

I've never looked into the Champ 600 before. It looks nice and it looks like a good mod candidate. What is really impressive it that it goes up to 12! That's one louder than 11! Hmm, just how big a speaker can you cram into that thing anyway?
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Old 16th June 2011, 12:57 PM   #129
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The people in other countries are screwed! I ordered $190 worth of parts from CE / AES the shipping was over $20 for UPS ground
I wasn't remembering that correctly. I ordered $169 worth of parts. Since my order was for over $100 they gave me "UPS 3 day for the price of ground". They charged me $28.20 to ship a 3.3 pound box. This is such a deal. Tracking shows it went from Tempe to Phoenix to San Diego to Ontario CA it is now in Portland Oregon. They claim it will be delivered here in Ft. Lauderdale Florida tomorrow! Allied charged me $18 to ship $45 worth of transformers, Antek was cheap $11 for 3 transformers. Once I get Mouser, Digikey and ESRC done, my hundred buck amp will have over $100 worth of shipping in it!

Last night I ordered some parts from Parts Express. The shipping came to $14. Their ordering page said If I spent $17 more I would get free shipping. So it looks like I got one of those Peavey Blue Marvel speakers for $3. If I don't like it I can always hook it up to something really loud and see what it takes to blow it up.
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Old 16th June 2011, 04:35 PM   #130
M Gregg is offline M Gregg  United Kingdom
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Originally Posted by TheGimp View Post
I'd like to make a proposal with regards to demonstrating the amps.

Although many of us are musically gifted, there are those of us who's greatest musical skill might be tuning an FM station (myself included).

It would be nice (helpful to some of us) if some of the more gifted would produce a wave file or other of the output of their guitar (buffered only) which could be used as the input of an amp for demonstration purposes.

If several people with different styles (Clean Lead, Heavy metal, Blues, etc) would do this, it would be possible to do more of an apples to apples comparison.

If enough people would do this, a demo cd could be made to show off the strengths and weaknesses of the designs.
Just for interest,

If you record guitar o/p for a dirty lick, clean lick, jazz lick, soul lick... they will all be clean..lol The amp makes the different sounds. Guitar O/P is not distorted just higher and lower volume.

However, recordings of each style with no compression might work. You would have to fiddle with the amp settings to get the desired distortion and each track would have to have the actual amp sound to follow it so you could compare to try and mimic it.

Good idea though!

Regards
M. Gregg
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