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Onkyo DX1400 Mods
I have had an old Onkyo DX1400 cdp for a few years. I got it cheap, second hand, scratched and knocked around with drink stains on and in one corner. That said, it plays quite well and has very...
View ArticleCan a power transformer be used "in reverse", in a TT speed controller?
I have acquired a 90s speed converter designed for the kind of AC motor used in a Linn TT - it adjusts speed by changing the frequency of the mains supply. It consists of a PCB with half a dozen chips...
View ArticleSolid state repairs in Europe
Have some weird idea in my mind .. I would like to electronically meet with people in Europe that or want to do teh same things that i do ...repair amplifiers feel free to join here Kind regards Sakis
View ArticleDEQX PDC-2.6P
I am selling basically unused DEQX PDC-2.6P in excellent condition - without single scratch with calibrated Behringer microphone kit, balanced analog output module (6xXLR) and preamp option. Unit comes...
View ArticleREL Q-Bass amplifier
Hello, I have a REL Q-Bass sub in need of some repairs to the amplifier section. I've tried contacting REL for the service manual or schematic but all they could offer were the manuals for the Q-50 and...
View ArticleLong Tail Pair with Negative Feedback Problem
Hello. I'm new here and I'm looking for some design help. I'm designing an amp and in the phase inverter (typ long tail pair) is where I'm introducing negative feedback from the output transformer....
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Better frequency response?
Hi folks! Currently I want to build a Onken enclosure speaker and I have trouble to choosing a right LF speaker driver. I think still I can't "read" frequency response characteristics of loudspeakers...
View ArticleUsing the heater supply to get a DC source
Hi, I want to put some solid state circuitry into a tube amp (namely an opamp to get a cheap and simple low impedance line-out from between the tube stages). The question is, could I use rectified...
View ArticleDynaudio alternatives
Hello I'm looking for some advice. I was looming at getting the below drivers for a 3wat design but I'm finishing it impossible so find them. Dynaudio 24w 100 / df 76 / d28-af Can anyone recommend...
View ArticleSure IR2092 2x250W bus pumping when idle
Linear PSU +-64V with no load connected. With amp connected it flies up to +-70V causing the OVP to kick in (I assume). When I shut it down the blue LEDs comes on briefly indicating oscillation....
View ArticleUSB AD/DA card for amp measurements?
Any proposals for USB connected soundcard to be used in amplifier distortion measuring and in loudspeaker measuring?
View ArticleMhdt Havana DAC equipment platform upgrade
I updated my blog and thought any Havana DAC owners would be interested in my latest project. A thick slab of steel as an equipment platform, and yes, it makes a huge difference. Joseph Crowe's DIY...
View ArticlePyle A200
Amp has defective power supply fets.. They are marked 28728 P3055 this amp is using 47 ohm gate resistors Anyone know what a good power supply fet is to use in this amp?
View ArticleWill PM4A/5A extend flat to 100HZ on OB?
Hi, I am thinking about building a two-way or three-way open baffle. And I am deciding on the fullrange driver. I may pick supravox 215EXC or Lowther PM4A/5A. The biggest buffle size I can allow is...
View Articlephono cable din wiring diagram
Is there a standard wiring patern for the din connector used by all the tonearm mfgrs for a din to rca phono cable?
View ArticleAnyone tried this Monoprice Bluetooth Receiver?
Here's the link. I'm looking for a Bluetooth receiver that will output both analog and digital and this seems like one of the very few options. I know it will not be the end-all-be-all in fidelity, but...
View ArticleLateral mosfet Protection Characteristics
Hi The C Audio Service notes for the XR3801 advise that the lateral mosfets date coded later than 4L3 exhibit different self-protection characteristics than previous production batches. Could anyone...
View ArticleJBL 2446H 2" Titanium Horn Driver
I was wondering if anyone thought this a good driver to use for home hifi? Its efficiency is rather high and so is its cost new from PE($839.00), though on ebay one can find it used for around $175. I...
View ArticleHello
Hello greetings can BF420 BF421 be used in place of 2SA1371 2SC3468 cant find 2SA1371 in my place warm regards andrew lebon:confused:
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New Find: 1956 Motorola 56A Table top radio
Hello, recently, I walked into a vintage audio shop looking for some old plastic radios. I collect small inexpensive tabletop AM radios, without the clock. I managed to find this little Motorola 56A in...
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