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modification

  1. I

    Ultimate Fosi Audio Box X2 Phono Preamp Mod

    Pedal Pimp Fosi X2 Mod Ever since purchasing my Fosi Audio Box X2 Phono Preamp, I’ve become obsessed with making it the best it can possibly be. After plenty of trial and error and extensive A/B testing, here’s what I’ve settled on: Outside Mods Feet: The stock cheap adhesive plastic feet on...
    • IASTM
    • Thread
    • fosi fosi x modification phono preamp tube rolling
    • Replies: 18
    • Forum: Turntables
  2. V

    Thorens TD160 paired with Heed Orbit 1

    Hi this is Giacomo, from Italy: 220Volt country :-). I have been lucky enough as a friend of mine gave me a Heed Orbit 1 power supply unit (PSU) for turntables with 110V motor for free. Let's it's a gift. The Orbit 1 is different from its brother Orbit 2, as Orbit 2 is a plug-and-play tool...
    • Vanvim0207
    • Thread
    • 110v circuit heed modification motor orbit1 phase shift psu thorens td160 turntable
    • Replies: 16
    • Forum: Turntables
  3. E

    Repurposing a 70s High Watt Receiver as a Bass Amplifier

    Hi hello, I currently have the opportunity to purchase a non-functioning Kenwood KR-9600 for quite cheap. I'm leaning toward purchasing this for standard repair, but was wondering if anyone had insight into possibly converting it to a bass amplifier. I think the most apparent issue I see are...
    • evanbalthaza
    • Thread
    • kenwood kr-9600 modification receiver advice silverface vintage
    • Replies: 2
    • Forum: DIY
  4. D

    Realistic Nova 7B with unknown modification

    I recently picked up a set of Realistic Nova 7Bs and a Realistic STA-77A receiver from facebook marketplace and speakers need some work. I've learned from the threads I need to recap them, planning on using these...
    • dekejones
    • Thread
    • driver modification nova 7b realistic realistic nova 7b speaker
    • Replies: 6
    • Forum: Speakers
  5. motleypixel

    Took a stab at testing and modifying my BIC DV62si Bookshelf Speakers...

    Hi folks, Please just "tell it to me straight" on areas I could improve on the testing process I define in my video below. Please do keep in mind I really didn't want to remove these speakers and do a "formal" near field test. I tried to keep the before and after as close to apples-to-apples as...
    • motleypixel
    • Thread
    • bic bic dv62si crossover diy frequency sweep hearing loss improve insulation modification rew
    • Replies: 4
    • Forum: Speakers
  6. ocdecio

    Model 250 Low serial number - modification / update

    I have here a 250 with a blown resistor in a place that it seems to happen quite often - R529. 39Ohm 1W. Reading the available addenda I see there is a prescribed "kludge" that I've seen in many original later 250 units. Has anyone here performed this modification on an OLDER 250 since the...
  7. T

    Dual hs 36 Ceramic cartridge pre amp for MM carts?

    Not too sure if this is the correct board to ask this but I was servicing a hs 36 and I wanted to replace the original ceramic cartridge with a MM cartridge until I realised that the pre amplifier is only built for ceramic cartridges. Is there any easy way to modify the internal circuit of the...
    • TrevorBarten
    • Thread
    • dual modification phono pre amplifier repair service
    • Replies: 3
    • Forum: Solid State
  8. Timothy Flath

    Thorens TD-160 Mk 1 Tune-Up and Setup Project

    This is the start of my latest Thorens TD-160 Project. Hope we can generate some good learning points and discussions for keeping these engineering marvels in top performing shape. Most of my updates will be via video links posted to my YT Channel and linked herein from time to time. Tips and...
    • Timothy Flath
    • Thread
    • mk 1 mk i modification setup td-160 thorens thurntable tuning upgrade
    • Replies: 57
    • Forum: Turntables
  9. KNielsen

    Aragon 4004 converted to MK.ll and maybe other mods

    Hey AK. I want to share this project as this might inspire others to either restore or make the fully rebuild. It should be mentioned that the Aragon 4004 in this thread is built by request, soo..... -some parts cannot be selected otherwise, as this is a request by the customer. The most...
    • KNielsen
    • Thread
    • 4004 4004mk.ii 4004mk.ll amplifier aragon aragon 4004 aragon 4004mk.ll mod modification restoration
    • Replies: 77
    • Forum: DIY
  10. sean sweeney

    Pioneer SA-9500 ii rebuild protect thump fix!

    I've been dealing with this 9500ii thumping ever since I rebuilt the amp and recapped, from the protect circuit (also rebuilt with upgraded caps and transistors)! It seems the more efficient newer transistors in the protect circuit were staying on too long at shut down and coming on instantly...
    • sean sweeney
    • Thread
    • circuit fix modification pioneer protection sa-9500ii thump
    • Replies: 4
    • Forum: Pioneer Audio
  11. B

    Yamaha A-1000, A-700 PSU Modification - Complete Basic Solution

    As a continuation of the thread: https://audiokarma.org/forums/index.php?threads/yamaha-a-1000-can-i-remove-the-whole-vertical-phono-board-and-everything-else-will-still-work.962306/#post-15203392 I've decided to develop a complete basic solution for power system modification in Yamaha A-1000...
    • bartek_k
    • Thread
    • a-1000 a-700 a1000 modification yamaha
    • Replies: 31
    • Forum: Yamaha
  12. B

    Low pass filter

    I am thinking about changing a pair of speakers by eliminating bi-amp and adding a low pass filter looking for thoughts: Have a pair of tower speakers (carver) which were originally designed to have freq input above 100 hz ( 4 ohm)to the first set of binding post and freq 100 and below (4 ohm)...
    • BernieH
    • Thread
    • butterworh crossover low pass modification
    • Replies: 4
    • Forum: DIY
  13. pwayland

    NAD 2400 PE THX rebuild/upgrade

    After many years of faithful service in many different roles, the time has come to tear down and make this one fresh again. For the power supply I've installed Mundorf with Nichi LKG with Vishay MKP film. I have in hand all the electrolytics (elna silmic) and MKPs where possible space wise as...
  14. P

    Ohm Acoustics model H woofer DIY project

    Hello. I recently picked up a pair of Ohm model H speakers in VG physical condition. It was clear that the woofer and passive radiators weren't original, but what I found when I opened them up surprised me. Refoam jobs and cabinet restorations are about all I get involved with, so this DIY...
    • P Free
    • Thread
    • crossover modification ohm acoustics woofer
    • Replies: 5
    • Forum: Speakers
  15. PE9ZZ

    Philips 22AH180 Repair/modding

    I made a little writeup about my adventures with a Philips 22AH180 "Black Tulip" TOTL tuner here. Enjoy!
    • PE9ZZ
    • Thread
    • 22ah180 black tulip display modification
    • Replies: 5
    • Forum: Tuners
  16. TDP333

    Monitor audio Isophon kk8 modifications

    Hi, I’m trying to establish what Monitor Audio doped these domes with. It appears to be a yellow-brown liquid, I guess most probably a type of glue, any ideas? I’ve always liked these tweeters but certain frequencies do ring a little, to my ear anyway, so I can understand why MA decided to...
    • TDP333
    • Thread
    • coating isophon modification monitor audio ram renovate tweeter tweeters
    • Replies: 4
    • Forum: Speakers
  17. T

    Disaster! Could use some help.

    I got a Technics SL-1950 and cleaned it all up and it was working perfectly. My intention was to take it apart a final time and clean everything one final time and perform the 78 RPM mod per...
    • thelanranger
    • Thread
    • 78 rpm turntable electrical engineering modification
    • Replies: 15
    • Forum: Turntables
  18. duncan

    NAD 7240PE recap, rechip, reconfigure & repurpose - a.k.a. Duncan's Folly

    Here's a story about how a recap job on an old NAD receiver got out of hand. This 7240PE has been doing duty as a preamp only. A while ago I decided to pursue optimizing the preamp section by the usual means: improving power filtering and signal coupling, updating op-amps where applicable. But...
    • duncan
    • Thread
    • 7240pe modification nad preamp
    • Replies: 1
    • Forum: DIY
  19. Taavip

    Modifying vintage Technics honeycomb speakers

    Hi Everyone! Long time reader, first time poster here. Recently acquired a pair of Technics SB-6 speakers with 10 inch honeycomb woofers: https://www.hifiengine.com/manual_library/technics/sb-6.shtml First and probably the most important impression was that they didn't reproduce decent...
    • Taavip
    • Thread
    • diy honeycomb modification technics
    • Replies: 4
    • Forum: Speakers
  20. TubieNewbie

    Conrad-Johnson MV55 Triode Mod

    I was reading the manual for my MV55 amplifier and it mentioned that my amp can be modified for triode operation. The following is an excerpt from the manual: Optionally, the MV55 may be reconnected internally for triode operation of the output stage, for exceptionally musical performance, but...
    • TubieNewbie
    • Thread
    • conrad-johnson modification mv55 triode tubes
    • Replies: 2
    • Forum: Tube Audio
  21. FireGuruMN

    Dynaco ST70 Mystery Modification

    I recently acquired (finally) a Dynaco ST70 for a reasonable expenditure. I intend to do the obvious things like replace defective caps and clean the pots. And replace the ORIGINAL Dynaco output tubes. But after cleaning out the spider webs I found some unwelcomed modifications. Here is a...
  22. Jesse W.

    Sony SS-B3000 true 3-way Mod

    Good day DIY’ers! I recently picked up some Sony SS-B3000 speaker from a thrift store. I have not hooked them up but I’ve gotten some advice to look for a modification to make these a true 3-way as there are no crossovers and the woofer runs full range. If anyone has seen, heard, done, or could...
    • Jesse W.
    • Thread
    • crossover conversion diy modification sony ss-b3000
    • Replies: 1
    • Forum: DIY
  23. Shane R.

    Denon 5600 pre-amp bypass idea / thoughts

    Hello, I'm new to audio style modifications but I recently picked up a avr 5600 and got a service manual for it (let me know if you want it on pdf) and the only feature that I find it lacking is a pre-amp bypass, having looked over the drawings I find that all the audio comes quite conveniently...
    • Shane R.
    • Thread
    • denon modification pre amp
    • Replies: 2
    • Forum: DIY
  24. duncan

    messing with the Muse "Mini PCM1793" DAC

    This old friend has been relegated to a drawer since the acquisition of a Bryston DAC for my main (okay, only) system, and I decided to tweak on it a bit. I included a couple of LME49720 op-amps in my last Mouser order with this DAC in mind. Today's lesson: how hard it is to work on these...
    • duncan
    • Thread
    • dac lme49720 modification muse
    • Replies: 8
    • Forum: DIY
  25. Ronito6

    New AU-X1 2772 order being assembled.

    Hello! I am currently gathering names of anyone interested in an upcoming order of my 2772. Just make your interest known here, and I will include you in the PM about the upcoming fabrication order. Ron Here is a thread about the board...
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