FDP Home Page / FDP Forum / FAQ's

The FDP is made possible by the following companies and individual members like you.
Please use the links below to show them we value their sponsorship.

Advertise here

Antique Electronics Supply

Guitar Center

Yellowjackets Tube Converters

Musician's Friend

Apex Tube Matching

Sweetwater

MOD KITS DIY

Amplified Parts

Jensen Loudspeakers

WD Music


* God bless America and our men and women in uniform *

* Illegitimi non carborundum! *

If you benefit and learn from the FDP and enjoy our site, please help support us and become a Contributing Member or make a Donation today! The FDP counts on YOU to help keep the site going with an annual contribution. It's quick and easy with PayPal. Please do it TODAY!

Chris Greene, Host & Founder

LOST YOUR PASSWORD?

......................................................................

   
FDP Jam
Calendar
Find musicians
in your area!
  Search the Forums  

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

Previous 20 Messages   Next 20 Messages  
darrengoleafs
Contributing Member
**********
**

WNY

I played Black Sabbath at 78 speed
Dec 14th, 2017 05:59 AM   Edit   Profile  

"I installed a bypass switch on the negative feedback loop on the '72 to make it sound more 'raw' for a raunchier tone"

I did this on my Champion 600. Also put a Weber in it.

I will try the tube swap first on this SF Champ.
And maybe grab a couple bear traps as well.
added more pics in profile...

kitchen-table amp tech-ery!

(This message was last edited by darrengoleafs at 08:14 AM, Dec 14th, 2017)

Peegoo
Contributing Member
**********
**********
******

Close

but no guitar
Dec 14th, 2017 01:10 PM   Edit   Profile  

Definitely not factory work!

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

WNY

I played Black Sabbath at 78 speed
Dec 18th, 2017 07:27 AM   Edit   Profile  

Switched out the power tube for an EH I had around and it is a big difference! Also threw in a 5751 preamp tube. Still wondering about this speaker and if a Weber will be better.
What kind of 6V6 tube was in there (see pic above)? The base is shorter and I cannot tell from the markings. From wiki it is a 'coin' based 6V6 from the 70's. It sounded tired.

Bopper
Contributing Member
**********
********

Motor City, USA

Better get hit in yo' soul
Dec 18th, 2017 08:28 AM   Edit   Profile  

"wonder what a Weber sig8s would sound like?"

I have an 8" Weber alnico Sig in a '65 Vibro Champ. I think it sounds really good.

Peegoo
Contributing Member
**********
**********
******

Curled up

in the fecal position
Dec 18th, 2017 09:03 AM   Edit   Profile  

darrengoleafs, that 6V6 looks like an RCA or GE 6V6GTA.

Like these, which are Fender re-brands.

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

WNY

I played Black Sabbath at 78 speed
Dec 18th, 2017 09:15 AM   Edit   Profile  

Peegoo, yup. No Fender brand but the same grey 6V6GTA is there. Guess a bear trap wouldnt trap that.

Bopper, gonna give this tube swap a chance. It is louder with a good 6V6 and the Oxford is in good shape. The whole amp is.

carsten

on the rhine

Dec 18th, 2017 03:21 PM   Edit   Profile  

Hi darrengoleafs!

I´ve tried quite a lot of different speakers in various Champs - including original Oxfords, now and old Jensens - and Weber signatures, too!
I like the older speakers for their lively sound and, generally speaking, lower volume.
If you would like more volume and punch from your (Ch)amp a Weber signature-model is worth a try!
I personally preferred the smooth-cone over the ribbed-cone variant.

cheers - C.



Leftee
Contributing Member
**********
**********

VA

Life makes a man tired.
Dec 19th, 2017 05:42 AM   Edit   Profile  

I'll echo carsten's comments - right down to the smooth cone. I'll also add that you have to sonically beat on the Weber signature a few hours to get it righteous. IMO, etc.

(This message was last edited by Leftee at 08:50 AM, Dec 19th, 2017)

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

WNY

I played Black Sabbath at 78 speed
Dec 19th, 2017 07:41 AM   Edit   Profile  

Thanks guys. Why smooth cone?
My thinking is ribbed. I put a smooth cone Weber in my Champion 600 when I modded that and have wondered about the ribbed ever since.

carsten

on the rhine

Dec 20th, 2017 04:18 PM   Edit   Profile  

Hi darrengoleafs!

I can´t really say "why"...
I just happen to own both (smooth and ribbed) - and the smooth-coned one sounds a tad fuller/sweeter to me.
It´s not a huge difference, though, and I might not even know (or care) if I didn´t have both ;-)

cheers - C.

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

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
**********
**

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
**********
**

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
**********
**

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
**********
**

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
**********
**

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
**********
*****

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)

Previous 20 Messages   Next 20 Messages  

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




Reply to this Topic
Display my email address             Lost your password?
Your Message:
Link Address (URL):
Link Title:




Moderators: Chris Greene  Iron Man  reverendrob  

FDP, LLC Privacy Policy: Your real name, username, and email
are held in confidence and not disclosed to any third parties, sold, or
used for anything other than FDP Forum registration unless you specifically authorize disclosure.

Furtkamp.com 
Internet Application Development

Copyright © 1999-2018 Fender Discussion Page, LLC   All Rights Reserved