Search found 32 matches

by 68strat
Tue Apr 11, 2023 11:24 am
Forum: Technical Discussion
Topic: SE pehaps another approach
Replies: 2
Views: 379

Re: SE pehaps another approach

Thanks man coming from you Mr Sluckey It's a way out. It will squish without a tube rectifier. I just know the circuit sounds good and see people here wanting to use Big Tubes in Se. Champ 12 has too much going on with the signal input to the 6L6 for me to understand. ( and get it correct ) Have a n...
by 68strat
Tue Apr 11, 2023 10:45 am
Forum: Technical Discussion
Topic: SE pehaps another approach
Replies: 2
Views: 379

SE pehaps another approach

I'm not smart enough to do this. But people here are. I own a Pure stock Champ 12 original tubes. Voltage doubling running screen half plate voltage. Ab 763 preamp. Clean but sounds so great. A sound of it's own super nice harmonic content. Approx 5k output transformer. Luv ya'll at tAG give it a lo...
by 68strat
Tue Mar 14, 2023 4:21 am
Forum: Technical Discussion
Topic: Reduced Ac line voltage and tube rectifier filament voltages
Replies: 10
Views: 657

Re: Reduced Ac line voltage and tube rectifier filament voltages

We are seeing about 2 to 3 volts less than expected with our line buckers. The transfomers we used are not the Organ brand name. They are off shore 12.6 volt ct. Listed as 117 volt input. 4 amp But the data sheet say 115 volt input 4 amp iirc Using tramsformers spec'd at 115 volts input on 120 to 12...
by 68strat
Sun Mar 12, 2023 3:21 am
Forum: Technical Discussion
Topic: Reduced Ac line voltage and tube rectifier filament voltages
Replies: 10
Views: 657

Re: Reduced Ac line voltage and tube rectifier filament voltages

Dear R.G. Sir, we Thank You so much for being so kind in sharing Your top level information with us and the world.
by 68strat
Sat Mar 11, 2023 10:26 pm
Forum: Technical Discussion
Topic: Reduced Ac line voltage and tube rectifier filament voltages
Replies: 10
Views: 657

Re: Reduced Ac line voltage and tube rectifier filament voltages

Thank you very much Martin Manning Why indeed, I do now see on GE 5ar4 tube data sheet, the 10 percent plus / minus 5 volt heater tolerance spec. Two Falcons 5y3 and a Deluxe Reverb gz34 mid 1960's are not my amps. It was my suggestion to build keen buckers. Later it became a concerned about low fil...
by 68strat
Sat Mar 11, 2023 5:24 pm
Forum: Technical Discussion
Topic: Reduced Ac line voltage and tube rectifier filament voltages
Replies: 10
Views: 657

Reduced Ac line voltage and tube rectifier filament voltages

Data sheets for tube rectifiers spec the filament - heater voltage. 5 volts for one example. With reduced Ac line voltages, when is a voltage lower than 5 volts to where it becomes a concern as to proper function of the tube rectifier. Is 4.7 or 4.3 volts ac going to lend to arcing or malfunction ca...
by 68strat
Thu May 05, 2022 3:26 am
Forum: Fender Discussion
Topic: Ab568 with cathode resistors
Replies: 6
Views: 1438

Re: Ab568 with cathode resistors update

Update on this ab568 Super Reverb Amp Thread.

An intermittent connection. Cracked solder on the
brass ground plate

Tech said amp sounds good.
No modifications will be done.

Thank you guys for your help He said!
He appreciated ya'll helping and not to mod info.
68strat says Thank you too !
by 68strat
Thu Feb 03, 2022 12:14 am
Forum: Fender Discussion
Topic: Ab568 with cathode resistors
Replies: 6
Views: 1438

Re: Ab568 with cathode resistors

Thanks pdf64 for the interesting information. Very helpful ! Appreciate you chiming in. Really does make a person wonder why CBS implemented the additional cathode resistors and capacitors to the output section in that run/era of amplifiers. Who really knows for sure except Leo and his team on the e...
by 68strat
Sun Jan 30, 2022 1:19 pm
Forum: Fender Discussion
Topic: Ab568 with cathode resistors
Replies: 6
Views: 1438

Re: Ab568 with cathode resistors

Shuckey and Stevem, I appreciate the great responses.

Very well explained, helpful, and I'll pass this information
along to the tech. The SR is in pristine condition looks wise.
With y'alls help, keep the circuit as stock as possible too.

I will Report back on this amplifier outcome. Thanks again.
by 68strat
Thu Jan 27, 2022 4:13 am
Forum: Fender Discussion
Topic: Ab568 with cathode resistors
Replies: 6
Views: 1438

Ab568 with cathode resistors

Has anyone restored reapaired or played a Fender ab568 2 6L6 amp? This ab568 super reverb has the 2 150 ohm 7 watt resistors ground to cathode. This is a cathode and fixed bias setup. Paul C designed a amp for heritage with cathode and fixed bias. He says you get chime at lower volume, then fixed bi...
by 68strat
Sat May 01, 2021 8:58 pm
Forum: Technical Discussion
Topic: Tube plot curve graph info
Replies: 2
Views: 352

Re: Tube plot curve graph info

Hey there Roberto. Thanks alot for that link and the page # 16.
by 68strat
Fri Apr 30, 2021 6:34 am
Forum: Technical Discussion
Topic: Tube plot curve graph info
Replies: 2
Views: 352

Tube plot curve graph info

68strat found a video and wanted to share. Ole guy tells it in an old school way. He makes it easy to understand. Plots from tube data sheet/s. I certainly learned from watching. ... Finally a clue. Hope ya'll can dig it. I did! .. 30 miniutes long video. Hope it helps someone and hope the ole dude ...
by 68strat
Sat Sep 09, 2017 1:22 am
Forum: Garage Talk
Topic: R.I.P. Walter Becker
Replies: 7
Views: 954

Re: R.I.P. Walter Becker

Mr. Becker rest in peace
by 68strat
Tue Sep 05, 2017 3:37 am
Forum: Garage Talk
Topic: We just fucking lost Bob S
Replies: 36
Views: 11636

Re: We just fucking lost Bob S

Im sorry you guys lost your friend Bob S
Rest in peace Bob S
by 68strat
Tue Sep 05, 2017 3:11 am
Forum: Garage Talk
Topic: R.I.P. Walter Becker
Replies: 7
Views: 954

Re: R.I.P. Walter Becker

yep mr walter, you kicked
Thank you for your music