What does the volume knob do - stupid newbie
Stupid newbie question, but I bet a lot of people (outside this forum) don't know the answer either. In a typical solid state amplifier (such as a home receiver), what does the volume knob control?...
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Acoustic-Fun PDM-10s PocketDAC
Our first foray into the more economical and portable segment of the market, it is called PDM-10s PocketDAC. Click here for larger photo (Webstore) Acoustic-Fun PDM-10s PocketDAC Webstore Link Like all...
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your input - bulb / led / neon selection for short tester
Hi everyone. I want to put together a shorts tester using this schematic. I have a few tube testers but want to pre-test using a black box before sticking the tubes in my tube tester. I have a few...
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How did I blow this fisher BA6000
I have this fisher BA6000 with the stk0100ii power amp chip. That amp came to me with a dead stk chip, I pulled the good chip and put it in he other ba6000 I had and sold that. So now I needed 2...
View Article12" or 15" with PRs.. Can't decide
So I have a bit of a dilemma... I can't decide whether I should go with 12 inch or 15 inch. Here's my setup so far to get better insight of what my goals are: This is in a 2004 Toyota Corolla Alpine...
View ArticleHow to measure/trigger/view low level 60/120hz hum?
Do you use an oscilloscope or a measuring mic to measure the inherent 60/120hz hum from your amp? Without anything hooked up at the input, the output of the amp has a very small hum that is only...
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FS Classe Model Seventy amp needs repair
A classe seventy amp with a burnt output transistor on the left channel(motorola SA1302) .I am second onwer and have in joyed it for 7 years have original box and manual. Front panel in 90% condition,...
View Articledigital oscilloscope group buy
Just guaging interest in trying to get a group buy going. I have no connections or discounts. I'm just interested and wondering whether anyone else also is? I'm thinking a digital 'scope with good...
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Bench Power Supply Questions ?
If I have 2 HP 6448B, can I hook them up in series to get 1200V ? Each 6448B is 600V max. Also, do the 2 bench power supplies have to be identical in order to be connected in series ? Does the voltage...
View ArticleStatic problem with DIR1701e
I have an static problem with a DIR1701e, it seems that this receiver is very sensitive for static. does this sound familiar
View ArticleSoles of Passion, Country Rock Duo, Are Gaining Popularity With Kenny Chesney...
Inspired by diverse influences, country duo Soles of Passion create a sound that’s all their own! The family friendly band is “a bit country, a bit rock, a bit progressive, a bit different,” with...
View ArticleDC Coupled amplifier capacitor vlaues
Hi Does anyone know If using larger value uf caps on the output of a DC coupled class AB amplifier would change the characteristics of the sound? It is currently using 2200Uf 63v caps, would there be...
View ArticleH/K AVI 200 & Sony STR-525 Amp Problem???
Needed help on a few receivers I have acquired. I've been reading this site for 1yr> & found it helpful. A little about myself & future plans. I'm a disabled Vet and for the last 4 yrs I...
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Roger Sanders Innersound ESL Amp
Hello all, selling my Roger Sanders Innersound ESL Amp. 600wpc@ 4 ohm, and 300wpc @ 8 ohm. This amp is specifically designed for ESL speakers, and handles complex loads like an ESL with brute force...
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Audio Research SP-11 HV Regulator
Getting back to this. Here's the HV Regulator in its original form: When I ran the bode plot, it looked a little lumpy and I thought it might be overly fussy compensation and snubberizing. I eliminated...
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Trying to test Hafler dh-500 mosfets
See below the schematic of the chips involved. I'm using a Fluke meter with diode settings and I get some diode readings where I 'm supposed to get open circuits. With gate on/off settings what...
View ArticleQuad 405 amplifier
Does anyone know why capacitor C10 was changed from 47uf to 100uf. Regards, Carbotec.
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FS Dale 4 ohm 1% 250 Watt Resistors
I have four new, never used Dale 4 ohm 1% non-inductive 250 Watt resistors. Use them in various series, parallel and series/parallel combinations for amplifier and power supply testing. Offered at a...
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Testing a transformer without a data sheet
I recently acquired a transformer for which I can't locate a data sheet. I would like to test it but at his point I am unsure of the primaries. The transformer has no serial number but here is a...
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