When you see 4 wires going to the speaker then two of those wires are as RG posted, high voltage DC to make a magnet.
This was done before the times of permanent magnets like Alnico became affordable.
Search found 4604 matches
- Mon Jun 03, 2024 11:09 am
- Forum: Technical Discussion
- Topic: OT mounted to speaker
- Replies: 8
- Views: 246
- Sun Jun 02, 2024 11:08 am
- Forum: Technical Discussion
- Topic: What do you think causes pins 2 and 3 to arc in octal sockets.
- Replies: 21
- Views: 490
Re: What do you think causes pins 2 and 3 to arc in octal sockets.
You can run any amp with a tube output stage with no load on it and suffer no problems, just don’t pump any signal thru it!
- Sun Jun 02, 2024 11:05 am
- Forum: Technical Discussion
- Topic: Extension Speaker Cab question
- Replies: 2
- Views: 96
Re: Extension Speaker Cab question
Running a mismatch ( 4 on a 8 for example) will also eat up your power tubes faster and change the overall frequency response at the extremes .
- Fri May 31, 2024 8:26 pm
- Forum: Technical Discussion
- Topic: Tremolo Changes after EL84 to 6V6 Swap
- Replies: 7
- Views: 271
Re: Tremolo Changes after EL84 to 6V6 Swap
Well -33 is well in the ball park for what a stock PR wants!
- Wed May 29, 2024 9:54 am
- Forum: Technical Discussion
- Topic: anyone looked at DR-Z stuff ?
- Replies: 2
- Views: 181
Re: anyone looked at DR-Z stuff ?
If you don't have it yet or even more so have not played it yet then why are you looking for mod's right off the bat?
- Tue May 28, 2024 10:01 am
- Forum: Technical Discussion
- Topic: What do you think causes pins 2 and 3 to arc in octal sockets.
- Replies: 21
- Views: 490
Re: What do you think causes pins 2 and 3 to arc in octal sockets.
I think it's also due to the ac filament power. Pin 3 is highly positive D.C. Pin 2 at a rate 50 or 60 times a second goes from being positive ac to zero and then that starts the attraction of D.C. Then pin2 then goes highly negative in relation to the D.C. Polarity of pin 3, so even a higher level ...
- Fri May 24, 2024 10:56 am
- Forum: Technical Discussion
- Topic: Fender Brownface 6G7a question
- Replies: 11
- Views: 533
Re: Fender Brownface 6G7a question
I don't know if you have ever heard it, but the tremolo on a Vibrochamp has great depth also .
Change out the caps to slow it down more and pop in as strong tube and your in love!
Change out the caps to slow it down more and pop in as strong tube and your in love!
- Mon May 20, 2024 8:35 pm
- Forum: Technical Discussion
- Topic: OT Primary Question
- Replies: 7
- Views: 659
Re: OT Primary Question
I don’t understand chancing running the 6K6 outputs.
The difference in the output wattage between these and a 6v6 with cathode bias and in push pull will not change the SPL of the amp by much if that’s your main goal.
The difference in the output wattage between these and a 6v6 with cathode bias and in push pull will not change the SPL of the amp by much if that’s your main goal.
- Sat May 18, 2024 11:30 am
- Forum: Technical Discussion
- Topic: Princeton Reverb tremolo squeal
- Replies: 5
- Views: 359
Re: Princeton Reverb tremolo squeal
Is the wire that feeds that pot running anywhere near either of the PI output coupling caps?
- Sat May 18, 2024 11:21 am
- Forum: Technical Discussion
- Topic: Replace overdrive pedal with real tube?
- Replies: 7
- Views: 477
Re: Replace overdrive pedal with real tube?
Since your now unused tube is somewhere down stream of the first gain stage of the amp if you implement what your thinking of doing you will more then likely have a oscillating monster on your hands, especially if you only use one section of that tube since that will change the phase of the whole am...
- Wed May 15, 2024 9:03 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1910
Re: Illinois brand capacitors still bad?
Don’t forget with these great little testers to discharge the cap before testing.
My co worker killed is tester 3 days after he built it with a charged up 450 volt cap.
You need to confirm after discharging that there is no more voltage left in the cap then the battery that powers it.
My co worker killed is tester 3 days after he built it with a charged up 450 volt cap.
You need to confirm after discharging that there is no more voltage left in the cap then the battery that powers it.
- Wed May 15, 2024 2:10 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1910
Re: Illinois brand capacitors still bad?
Here’s a 1000uf 50v Rubycon that swollen and starting to leak and it still test out at only .94 ohms, unfortunately it’s only 5 years old.
- Tue May 14, 2024 12:21 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1910
Re: Illinois brand capacitors still bad?
Yes, sorry, more like ten times!
I had the morning coffee brewing but none yet to start the brain up.
I had the morning coffee brewing but none yet to start the brain up.
- Tue May 14, 2024 11:20 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1910
Re: Illinois brand capacitors still bad?
Thanks for this test out and post, and yes that’s over a 10% different which is a lot!
- Sat May 11, 2024 11:19 am
- Forum: Technical Discussion
- Topic: Can I Parallel 2 Mosfets in VVR?
- Replies: 38
- Views: 1522
Re: Can I Parallel 2 Mosfets in VVR?
They also need to be mounted right next to each other so that all wire length used is the shortest. Also I consider the leads of semiconductors as part of its built in heat sink and as such contributing to the items wattage rating. For Zener diodes used in tube amps ( especially if near the output t...