WTB - Leach Amp PCB
Looking for a Leach PCB set - High-ish power version (10 output transistor version)... Thanks
View ArticleThreshold S/550E service info
I just got a Threshold S/550E in for service and I'm curious if anyone has worked on these. it powers up ok, no blown fuses, but no audio either, once channel has some very weak half wave that leaks...
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Loadlines for Parallel SE outputs
I'm putting together this PSE amp using the 12B4 doubled up running into an OPT at 2500 ohms. With only 170VDC for my B+, I get a really 'steep' loadline for the 12B4......my question is 'How does one...
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Pics Altec Open Baffle Bass 'horn'
Current project is a 3-way 'Altec' horn system, featuring a radical mid bass open baffle 'horn' (wave guide) from Bert Doppenberg (of Oris fame). http://forum.bd-design.nl/index.php?id=17004 Bert's...
View ArticleKrell power transistors
Howdy folks, I recently got a hold of a number of Krell power transistors 484002 and 484081. Does anyone have the definitive specs on them? Are they the TO 3 versions of 2SC3281/2SA1302 or early...
View ArticleBasic questions on configuring Tube AMP
Well, I am close to finish my Simple SE amp. This is my first amp and was lovely to work on it. When I jumped finally to the wiring diagram page, I found too much information I am not familiar with...
View Articleadding current limiting to a power supply
i picked up a homemade power supply from a swap meet recently and just opened it up to see how it works. it uses an LM338 as a voltage regulator at 22V and the transformer has a 24V/50VA secondary....
View ArticleAttenuation of Ribbon tweeter: Lpad or simple resistor?
Ive built a few DIY efforts over the years, and though an LPAD has advantages over a simple resistor, Ive never experienced problems. I understand that the extra series R the attenuated driver 'system'...
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BRZ 1700.1d
hi all This amp came in with one shorted output.I remove all the outputs from the board. I have both - + reg and rail voltage.some one did some work on this amp before i got it.I want to find out on...
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For Sale: Pixelworks PW338 LCD Controller Board + Remote + IR eye+ Keypad
PW338 for sale. Excellent for DIY projectors and monitors. It's a high quality controller board with unique feature of 1:1 pixel mapping. Used few times. Fully working. I planned to make DIY monitor 2...
View ArticleBoutique fuses
Why are boutique fuses made with gold or silver fuse wire? One possible issue with any fuse is that the internal wire does get quite hot in normal use and the resistance will vary with the current....
View ArticleWhat do you like?
I've been a lurking about among all the threads. Amps were easy and I feel comfortable with a chipamp kit like LM3875 or LM 4780. Speakers are a whole new game. I have not looked at audio for years...
View ArticleKT88 design questions
I finally had time to sit down and have a cold one with the snow that is falling and draw up a schematic for a KT88 amp. Planning on using edcor x-formers. Power supply will use a 375-0-375 @200 or...
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Vertical Mosfet Amplifier with high THD distortion levels
Hi everyone, I'm new at solid state amplifier design, I've made this designs based on Bob Cordell's book, but I don't know if they work because my last designs were based in Randy Slone's book and they...
View ArticlePretty tweeters
Hi, Im looking for a good looking tweeter that can play in a three way with 2 m8N woofers and the m6N as midrange. I love the look of these drivers and will not cover these up so I would like to hear...
View ArticleNoise in left channel - modded SE 40
Hello all. My rev 3 SE 40 has lately developed a noise in the left channel only. Jeff G did a full tilt mod to the board 5-6 yrs ago and I've since enjoyed the amp immensely. The last few months the...
View ArticleWTB HI-VI midbass
Looking for the N series by HI-Vi. I have the m8n and due to the breakup around 2k i'm looking for a midbass speaker to pair with it. Preferably the M5N seams appropriate but let me know what you have....
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Need some help with Thiel CS3.5 crossovers
I've noticed some issues with my 3.5's recently so I decided to pull the woofers and take a look at the caps. Low and behold I have a couple blown caps. I intend to recap them myself. However there are...
View ArticleLM3875 gainclone too much treble
Hi Just getting my LM3875 to work properly ... sound is good ... but compared to my Gainclone LM1875 ... the LM3875 has more treble and less bass based on my listening ... isnt it normal ...? How to...
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Synthesizer power distribution
I was able to repair the power supply on my synth. The 5VDC and the +/-15vdc are both good. Power seems to be where it should be on the Oscillator, filters etc. The 5VDC for the logic board is present...
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