Search found 3043 matches

by sluckey
Tue Mar 26, 2024 11:53 pm
Forum: Technical Discussion
Topic: Deluxe Reverb Build
Replies: 6
Views: 159

Re: Deluxe Reverb Build

It's been linked to DPS (double post syndrome). :mrgreen:
by sluckey
Tue Mar 26, 2024 4:28 pm
Forum: Technical Discussion
Topic: Deluxe Reverb Build
Replies: 6
Views: 159

Re: Deluxe Reverb Build

V5A grid needs a resistor to ground.
by sluckey
Mon Mar 25, 2024 3:10 pm
Forum: Marshall Discussion
Topic: 2204 build voltages are off
Replies: 9
Views: 255

Re: 2204 build voltages are off

Voltages will be high until you plug in the power tubes.
by sluckey
Mon Mar 25, 2024 4:28 am
Forum: Technical Discussion
Topic: Power filter schematic change help
Replies: 11
Views: 197

Re: Power filter schematic change help

dpb703 wrote: Mon Mar 25, 2024 3:31 am In terms of posting the entire schematic, I’ve gotta check whether there’s a copyright mark on it.
Never mind. I've seen it. I suggest you just build it according to Weber's plan.
by sluckey
Sun Mar 24, 2024 3:19 pm
Forum: Technical Discussion
Topic: Flash seen from bottom of 12AT7 PI socket
Replies: 22
Views: 455

Re: Flash seen from bottom of 12AT7 PI socket

pjd3 wrote: Sun Mar 24, 2024 1:28 pm Can a similar thing be some with the 6.3vac filament circuit?
Use a thermistor in series with the primary winding to prevent high inrush current at turn-on.
by sluckey
Sun Mar 24, 2024 2:45 pm
Forum: Technical Discussion
Topic: Power filter schematic change help
Replies: 11
Views: 197

Re: Power filter schematic change help

Then there has to be a reason for the the 2 40uf caps in series, why else would the designer opt for 2 in series over just one 20uf cap? It's common practice to put two filter caps in series in order to have a higher voltage rating. This entire filter section is just stupid. Looks like a Weber draw...
by sluckey
Sun Mar 24, 2024 1:08 am
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 414

Re: Heater Wire Ground

I just think about the millions of top name amps that never fused the filaments. And I also remember the first new car I bought in the '60s... lap seat belts were optional, and you had to pay extra!
by sluckey
Sun Mar 24, 2024 12:15 am
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 414

Re: Heater Wire Ground

It's not for the actual heater currents. It's in case the CT is grounded and one heater wire breaks or otherwise gets shorted to the chassis or signal ground. I've been doing this stuff since '65 and have never witnessed such a failure. Have you? This just sounds like one of those new age theoretic...
by sluckey
Sat Mar 23, 2024 6:02 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 414

Re: Heater Wire Ground

A hard CT requires two fuses, one on each end. That's twice you've said that recently. I think two fuses is redundant. The same filament current flows from top end of the filament winding through the filaments and back into the bottom end of the winding. No current flows into the center tap. It onl...
by sluckey
Sat Mar 23, 2024 5:20 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 414

Re: Heater Wire Ground

It's redundant. Use one or the other. I prefer the resistors. Why do you prefer the resistors? I like the pretty colors. But there's also a technical advantage. It's not uncommon for an output tube such as a 6L6 to have an arc between pins 3 and 2. This arc is usually a result of playing loudly and...
by sluckey
Sat Mar 23, 2024 5:08 pm
Forum: Technical Discussion
Topic: Bias range question.
Replies: 27
Views: 512

Re: Bias range question.

martin manning wrote: Sat Mar 23, 2024 2:08 pm If it's -100F outside, I'm not going ;^)
That's my point. -100° is definitely more cold than -10°.
by sluckey
Sat Mar 23, 2024 5:03 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 414

Re: Heater Wire Ground

It's redundant. Use one or the other. I prefer the resistors.
by sluckey
Sat Mar 23, 2024 1:42 pm
Forum: Technical Discussion
Topic: Bias range question.
Replies: 27
Views: 512

Re: Bias range question.

-100V is definitely more than -10V. Which will push more current through a resistor? Which would cause more pain if accidentally touched?
by sluckey
Thu Mar 21, 2024 11:52 pm
Forum: Fender Discussion
Topic: Can I use a Bassman 70watts PT and OT for a Deluxe reverb?
Replies: 10
Views: 255

Re: Can I use a Bassman 70watts PT and OT for a Deluxe reverb?

The Bassman 10 is a silverface amp, but it's 50 watts, not 70 watts. And it is not a U/L amp.
by sluckey
Wed Mar 20, 2024 7:33 pm
Forum: Dumble Discussion
Topic: C-lator hum
Replies: 170
Views: 2885

Re: C-lator hum

CAUSE OF PROBLEM IDENTIFIED! As I postulated in my opening post it is caused by the proximity of the PT to the rectifier! Move it far out of the chassis and this hum is gone! I seem to remember that was suggested a long time ago. Glad to see you finally give it a try. :wink: https://ampgarage.com/f...