Search found 1676 matches
- Mon May 20, 2024 10:56 am
- Forum: Technical Discussion
- Topic: Common Mode Filtering - A slightly impractical approach to reducing heater induced noise
- Replies: 9
- Views: 243
Re: Common Mode Filtering - A slightly impractical approach to reducing heater induced noise
Are you using a toroidal power transformer? I'd be surprised to see 50kHz on the secondary of an EI transformer
- Wed May 15, 2024 4:17 pm
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1179
Re: Illinois brand capacitors still bad?
I have one of those cheap cap checkers (different brand) and I wonder if the measured value is similar when the cap is in circuit with high.voltage on the plates. The caps were measured out of circuit. I tried to make it as accurate as possible. Sorry I wasn't clear Mark. I meant after they were un...
- Wed May 15, 2024 11:28 am
- Forum: Technical Discussion
- Topic: Does a 'bright cap' really boost highs?
- Replies: 23
- Views: 5472
Re: Does a 'bright cap' really boost highs?
Ha, thats great Max. I have from time to time imagined electron flow in strange analogous ways to give some visual to the actions. "But, to truly know the electron, you must "Be" the electron" - Bruce B+ Semi-sincerely yours, Phil D. To truly know the electron you must know quarks, quantum chromody...
- Wed May 15, 2024 11:14 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1179
Re: Illinois brand capacitors still bad?
I have one of those cheap cap checkers (different brand) and I wonder if the measured value is similar when the cap is in circuit with high.voltage on the plates.
- Wed May 15, 2024 12:21 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 29
- Views: 1179
Re: Illinois brand capacitors still bad?
Were they fresh off the shelf, or after some time under voltage to form the dielectric?
- Mon May 13, 2024 11:44 am
- Forum: Technical Discussion
- Topic: Can I Parallel 2 Mosfets in VVR?
- Replies: 31
- Views: 789
Re: Can I Parallel 2 Mosfets in VVR?
That is one hellified heatsink! With a fan across it, it should create frost on your FET.
- Mon May 13, 2024 11:32 am
- Forum: Technical Discussion
- Topic: Hypothetical Amp Discussion
- Replies: 9
- Views: 421
Re: Hypothetical Amp Discussion
It looks like you have some soldering experience. A Champ is an easy build, but you might not really use it for much more than a training tool. A Deluxe might be of more use. It has a little more complexity. It might be a good starter for you as the circuit is push pull, like the amp you will finall...
- Fri May 10, 2024 9:04 pm
- Forum: Technical Discussion
- Topic: Two 20 watt amps in one chassis - layout/grounding
- Replies: 17
- Views: 516
Re: Two 20 watt amps in one chassis - layout/grounding
Keep us posted on progress. And on the baritone also. I've had an interest in those and think my big hands need a vacation on the broad plank of a bari.
- Fri May 10, 2024 1:32 am
- Forum: Technical Discussion
- Topic: Two 20 watt amps in one chassis - layout/grounding
- Replies: 17
- Views: 516
Re: Two 20 watt amps in one chassis - layout/grounding
Or separate pre and power chassis. I did a stereo pre (originally for my Betterbacker) and coupled it with a stereo KT66 power amp for my T. V.
Never mind Phil. I see from your other post this must fit in a Twin combo cabinet.- Tue May 07, 2024 9:21 pm
- Forum: Technical Discussion
- Topic: Hypothetical Amp Discussion
- Replies: 9
- Views: 421
Re: Hypothetical Amp Discussion
One tube per effects loop. Maybe half a tube, if you can steal the drive signal from the signal chain. . And if using a 6AW8 It's the only tube needed for both reverb drive and recovery. Anything can be done. To pull it off though you'll need a bit of experience. Have you built much, and have extens...
- Tue May 07, 2024 9:00 pm
- Forum: Technical Discussion
- Topic: Bad power?
- Replies: 10
- Views: 306
Re: Bad power?
What gauge is the 100 yd. Wire? And does it power lights, heat or air conditioning also? You may have only 85 volts due to IR losses.
- Tue May 07, 2024 8:55 pm
- Forum: Technical Discussion
- Topic: Two 20 watt amps in one chassis - layout/grounding
- Replies: 17
- Views: 516
Re: Two 20 watt amps in one chassis - layout/grounding
Phil you can have centered vol controls. Just have the input stages on each end. Your volume controls will be after several gain stages anyway so they're at line level now. Using shielded cable you should still get low hum.
- Tue May 07, 2024 8:46 pm
- Forum: Technical Discussion
- Topic: HILGEN BASSO 2501 Bass Amp Help Needed....
- Replies: 5
- Views: 168
Re: HILGEN BASSO 2501 Bass Amp Help Needed....
Yes, with 3 stages feeding your splitter you can get enough gain to satisfy. See if your tech is up for the challenge. Of course after he has verified correct operation as it sits. He could find degraded parts and their replacement might make it sound to your liking.
- Sun May 05, 2024 8:41 am
- Forum: Technical Discussion
- Topic: HILGEN BASSO 2501 Bass Amp Help Needed....
- Replies: 5
- Views: 168
Re: HILGEN BASSO 2591 Bass Amp Help Needed....
I'd also cut C8 down progressively.
Reduce C9 and C10 to 22nF.
But for what you want I'd redesign it to a single channel to add your gain stages.
Reduce C9 and C10 to 22nF.
But for what you want I'd redesign it to a single channel to add your gain stages.
- Fri May 03, 2024 8:46 pm
- Forum: Technical Discussion
- Topic: Two 20 watt amps in one chassis - layout/grounding
- Replies: 17
- Views: 516
Re: Two 20 watt amps in one chassis - layout/grounding
Best to build them as parallel pairs that share no components. Though a beefy supply well controlled should supply the power needed with little interaction. I would build them as mirror images of each other with the power supplies in the center of the chassis. The inputs on each end.