Search found 487 matches
- Thu Feb 22, 2024 5:02 pm
- Forum: Technical Discussion
- Topic: Transformer rescue
- Replies: 6
- Views: 381
Re: Transformer rescue
Thanks for the suggestions.
- Thu Feb 22, 2024 5:00 pm
- Forum: Technical Discussion
- Topic: What do you believe regarding the sound of passive components?
- Replies: 185
- Views: 4929
Re: What do you believe about the sound of passive components?
I think that in a controlled environment, using people with excellent hearing, you might detect some subtle differences. I would only trust double-blind tests, as humans are all too easily fooled (including themselves). I've caught myself thinking I heard a difference when adjusting the control on t...
- Tue Feb 20, 2024 9:00 pm
- Forum: Technical Discussion
- Topic: Transformer rescue
- Replies: 6
- Views: 381
Transformer rescue
I have an amp on the bench (DR201) that got dropped, the huge PT sheared it bolts and yanked all the wires coming out of the PT breaking at least one. Is there a safe way to remove the transformer coil wrapping (to see if this can be rescued)? Using anything sharp, I'd be afraid of nicking or cuttin...
- Thu Feb 15, 2024 5:38 pm
- Forum: Technical Discussion
- Topic: New Astron caps?!?
- Replies: 22
- Views: 885
- Wed Feb 14, 2024 9:31 pm
- Forum: Technical Discussion
- Topic: New Astron caps?!?
- Replies: 22
- Views: 885
Re: New Astron caps?!?
Anyone can buy (or steal) the rights to a brand name, and start producing product with the branding and look of the original (in this case being produced by "Shin-ei, LLC" perhaps another purchased brand name, lol.) Call me cynical, but I propose that if they look really good it'd be hard to objecti...
- Fri Feb 09, 2024 6:20 pm
- Forum: Technical Discussion
- Topic: uTracer (Micro Curve Tracer)
- Replies: 300
- Views: 86932
Re: uTracer (Micro Curve Tracer)
I also have a kit I never built (somehow I ended up ordering a second one by accident)
- Fri Feb 09, 2024 6:09 pm
- Forum: Technical Discussion
- Topic: Resistor identification?
- Replies: 11
- Views: 306
Re: Resistor identification?
Definitely metal or metal oxide film on a ceramic substrate. Given the apparent age and 2% rating, I'd guess MF.
- Thu Jan 25, 2024 9:18 pm
- Forum: Technical Discussion
- Topic: HiWatt DR-103 Phase Inverter
- Replies: 11
- Views: 488
Re: HiWatt DR-103 Phase Inverter
There's actually very little practical difference between the two. In the earlier case, the signal travels through the bias-setting tube (which will add a smidgen of harmonic distortion) and in the later case the signal bypasses the tube and goes directly to the PI input. The loading on the previous...
- Tue Jan 09, 2024 9:34 pm
- Forum: Technical Discussion
- Topic: 6L6 vs KT66
- Replies: 26
- Views: 31478
Re: 6L6 vs KT66
Mentioned up the thread, KT stands for "Kinkless Tetrode." Normal tetrodes have a kink in their characteristic curves. Beam-forming plates in KTs (and 6L6) largely remove this kink and provide a smoother pentode-like response.
- Mon Nov 13, 2023 9:41 pm
- Forum: Technical Discussion
- Topic: Input requested: Matchless Chieftain build (with original and modified schematics included)
- Replies: 6
- Views: 1254
Re: Input requested: Matchless Chieftain build (with original and modified schematics included)
Functionally it looks OK. Traynors always seemed to have high voltage B+ windings, so I'd check the AC voltage and do the math (Vp = 1.4 x Vac) to make sure the voltage at the first cap doesn't exceed its rating.
- Tue Oct 10, 2023 8:20 pm
- Forum: Speakers and Cabinets
- Topic: Eminence acquired by B&C
- Replies: 15
- Views: 44824
Eminence acquired by B&C
Just got this from Eminence today:
B&C (Italy) has bought out Eminence. The brand and existing KY factory will continue for now, the China factory will be moved elsewhere in Dongguan.
B&C (Italy) has bought out Eminence. The brand and existing KY factory will continue for now, the China factory will be moved elsewhere in Dongguan.
- Wed Apr 19, 2023 8:24 pm
- Forum: Technical Discussion
- Topic: Trusted brand 100w resistors?
- Replies: 14
- Views: 1250
Re: Trusted brand 100w resistors?
An important point: the ceramic high wattage resistors are rated in free air, not enclosed in a box. Lots of venting or perhaps even forced air is recommended. The gold aluminum ones further require hefty heat sinks to get to their full rating, as shown above. :) The THD Hot Plate cleverly uses some...
- Wed Apr 19, 2023 8:18 pm
- Forum: Technical Discussion
- Topic: THD hot plate serious question. DID IT KILL MY AMPS?
- Replies: 7
- Views: 2067
Re: THD hot plate serious question. DID IT KILL MY AMPS?
Yes, a solid state amp is more forgiving on the high impedance side. With the rare exception, you can even run a SS amp open-circuit with no damage. Modern high quality SS amps have built-in protection that will cut the output when a very low output impedance is detected. Tube amps are more forgivin...
- Wed Apr 19, 2023 8:02 pm
- Forum: Vox/Hiwatt Discussion
- Topic: Hiwatt Hybrid Preamp
- Replies: 16
- Views: 10096
Re: Hiwatt Hybrid Preamp
Here's a Euro option: https://www.tube-town.net/ttstore/tt-dr ... ormer.html
- Tue Apr 18, 2023 6:37 pm
- Forum: Technical Discussion
- Topic: Clean preamp circuit with bright input stage?
- Replies: 6
- Views: 1008
Re: Clean preamp circuit with bright input stage?
You could try an early Hiwatt pre, the tone stack is different than the traditional F/M ones. https://hiwatt.org/Schematics/DR_Pre4Input_v1a.pdf