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FDP Forum / Fender Amps: Vintage (before 1985) / '79 Champ

Previous 20 Messages  
darrengoleafs
Contributing Member
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WNY

I played Black Sabbath at 78 speed
Dec 20th, 2017 06:50 PM   Edit   Profile  

Thanks carsten, "fuller/sweeter" makes sense. And FWIW, Weber is currently out of the smooth 8" sig. I think I will wait for now and get to know this amp with the Oxford speaker and some tube swaps.

darrengoleafs
Contributing Member
**********
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WNY

I played Black Sabbath at 78 speed
Apr 6th, 2018 10:04 AM   Edit   Profile  

I am having an issue.

No sound. All 3 tubes light up but power tube is excessively hot!

Any ideas?

Hammond101
Contributing Member
**********
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So. Cal. USA

Apr 6th, 2018 11:46 AM   Edit   Profile  

Did the RCA speaker plug fall out of the chassis jack? I don't like that set up. Gravity tends to make it fail. Your amp may have it.

If plugged in you might want to test with another speaker. It may have failed. Measure the static resistance of the stock speaker voice coil to test.

You may have an issue with bias. That amp is cathode biased so this could mean the bias resistor or cap could have failed.

You may have a failing rectifier tube.

You may have a failed power tube.

If the '79 amp was not serviced and filter caps replaced the failure could be more serious.

Other than the speaker however, the other failures usually result in some noise(s)

It really is difficult to say unless the amp is on the bench.

darrengoleafs
Contributing Member
**********
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WNY

I played Black Sabbath at 78 speed
Apr 7th, 2018 02:30 AM   Edit   Profile  

Thanks Hammond101! The rca speaker plug is a snug fit.
I replaced the pre-amp tube and viola! Could not tell by looking at it.
I had a 5751 Sovtek in there, now a 12ax7 EH...and more gain. Kinda prefer the 5751.

However, as stated earlier in the post, I must get either some retainers or new sockets. It is not moving at the moment but I do think the power and rectifier tubes would fall right out with not much effort.

Hammond101
Contributing Member
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So. Cal. USA

Apr 7th, 2018 03:46 PM   Edit   Profile  

See the tube socket clean and re-tension thread on the amp repair page. That will help. I'd add bear trap type retainers for the power and rectifier tubes.

If this thing has not been serviced I'd get those electrolytics replaced.

carsten

on the rhine

Apr 7th, 2018 04:05 PM   Edit   Profile  

Hi darren!

I also had tubes fall out of some of my Champs ;-)

But - you don't even have to get new tube-sockets! A good tech can clean and re-tension the old ones at a fraction of the cost.

Hope you'll get it up + running again!

cheers - C.

Taildragger
Contributing Member
**********

USA

an acquired taste some may never acquire
Apr 8th, 2018 07:08 PM   Edit   Profile  

I have a 1978 SFVC that I put a Weber Alnico Sig 8 (no ribs) into.

I'm focused mostly on bass these days and don't really play electric guitar as much anymore, but I've hung onto that amp because it's great for those occasions when I do still practice guitar.

Years ago, I also had Weber build me a 5E3-sized cab with Weber 12A125-0 in it that I can run either a 5F1 Champ or the '78 SFVC through for a bit more grunt. Won't get you all the way into Tweed Deluxe territory, but it is a step up from the 8"-ers and smaller cabs.

I actually like the SFVC better than the SF (non-reverb) Princeton I had, which had too much headroom for my taste.

darrengoleafs
Contributing Member
**********
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WNY

I played Black Sabbath at 78 speed
Apr 10th, 2018 01:13 PM   Edit   Profile  

Thank you gents!

It really is a great little amp and definitely worth putting $ and care into.

Pinetree
Moderator Emeritus
(with many stars)

NW Pennsylvania

Apr 24th, 2018 12:06 PM   Edit   Profile  

I have a Weber in one of my Champs, and a Eminence 820H in the udder.


It's all good.

tiller2
Contributing Member
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Washington DC

Apr 24th, 2018 09:12 PM   Edit   Profile  

I bought a Silverface Champ and the original speaker was farty on bass/E-string notes, so I replaced the speaker with a Weber 8A125 4 ohm. It sounded cleaner and better immediately, and even better as it broke in over the next few months.

(This message was last edited by tiller2 at 08:18 AM, Apr 25th, 2018)

darrengoleafs
Contributing Member
**********
***

WNY

I played Black Sabbath at 78 speed
Oct 1st, 2018 01:41 PM   Edit   Profile  

tiller2, this is what I have done recently and its great. Also have a retube set coming from the tube store, I went with the mid level with the Tung Sol 6v6.
Which leads me to my question, how worried should I be about the cap(s) in this thing? I was going to retension the sockets but may just have him do it if he does the caps. Is the failed 5751 tube an indication of something?

BbendFender
Contributing Member
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American Patriot

About as ordinary as you can get.
Oct 1st, 2018 02:40 PM   Edit   Profile  

If the electrolytic cap hasn't been changed, I would change it. 39 years is risky.

Hammond101
Contributing Member
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So. Cal. USA

Oct 1st, 2018 02:46 PM   Edit   Profile  

Yeah, that can cap is really suspect. It really need to be replaced. Power rail resistors and the bias cap and resistor should be done too.

I'd check the bypass cap(s) and resistors to. might as well do it all and have a usable, fun little amp.

The failed 5751 most likely means nothing but unless you are capable of checking voltages you really never know.

darrengoleafs
Contributing Member
**********
***

WNY

I played Black Sabbath at 78 speed
Oct 1st, 2018 03:06 PM   Edit   Profile  

I just spoke to him and he said under $200...about an hour he said. Caps and re-tension sockets.

A ball park price for this?

Hammond101
Contributing Member
**********
***

So. Cal. USA

Oct 1st, 2018 04:32 PM   Edit   Profile  

The cap can is about $40 figure another $20 for misc small parts & supplies. Labor??? Under $200 sounds fair enough as long as it doesn't need tubes.

darrengoleafs
Contributing Member
**********
***

WNY

I played Black Sabbath at 78 speed
Oct 2nd, 2018 08:36 AM   Edit   Profile  

I figured as much. No tubes needed (on the way from the tube store). Thanks.

It sounds fantastic now with the new Weber. New tubes and caps should be an improvement as well.

And I thought it sounded good when I first got it!


Hammond101
Contributing Member
**********
***

So. Cal. USA

Oct 2nd, 2018 12:43 PM   Edit   Profile  

Typically these amps get louder and tighter when the filter caps are replaced, less compressed.

darrengoleafs
Contributing Member
**********
***

WNY

I played Black Sabbath at 78 speed
Oct 2nd, 2018 03:13 PM   Edit   Profile  

Hammond101, I hate to ask but I will....am I going to like it?

It really sounds great right now. Louder with the Weber but breaks up beautifully.

Hammond101
Contributing Member
**********
***

So. Cal. USA

Oct 2nd, 2018 04:46 PM   Edit   Profile  

Darren, That is a tough call because everyone's tastes are different. IMO you will still have plenty of natural grind although the amp may be a bit louder when this happens.

The beauty of having the power section strong is that lows can be lows without being flabby even if broken up.

Personally I like the way the tweed Champs and Princetons break up better than black and silver face Champs/Vibro-Champs but that's just me. (Well me and Billy Gibbons) :-)

Your Weber is most likely just more efficient so the amp is louder now. You should be quite pleased with a power section overhaul.

I've always thought the best thing to do was to get the amp in spec first then see how you like it. If it's not what you want it's not the amps fault. You need to find you sound with an amp (or pedal(s)) you really enjoy.

darrengoleafs
Contributing Member
**********
***

WNY

I played Black Sabbath at 78 speed
Oct 2nd, 2018 07:51 PM   Edit   Profile  

Thanks Hammond. Getting it in spec makes sense.
I have a Custom Tweed Champ for comparison too. Definately a different break up. I am just going to enjoy spending time deciding which I like better...;)

Previous 20 Messages  

FDP Forum / Fender Amps: Vintage (before 1985) / '79 Champ




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