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The AM Window: Tech: Mods: HQ Receivers
http://www.amwindow.org/tech/htm/hqaudiomods.htm
The AM Window: Tech: Mods: HQ Receivers. Audio Mods for Hammarlund HQ Series Receivers. Background. Hammarlund receivers are some of the nicest AM receivers out there. They sound great right out of the box. You can generally find them for reasonable prices even on Ebay. They have nice wide IF stages and are very simple to use.
N9EWO Review : ICOM IC-R75 HF Receiver (with Kiwa Audio Mods)
https://www.qsl.net/n9ewo/icr75.html
The IC-R75 is a respectable digital tabletop communications receiver. Decent overall performance / ergonomics and very good SSB audio out of the box. Caveats are it's greatly muffled "AM Mode" audio quality, which can be fixed for the most part with …
R-390A Audio Mods - AM Window
http://www.amwindow.org/tech/htm/r390aud.htm
Unplug the receiver and remove the bottom cover. Locate the audio subchassis (it's on the bottom of the radio and has five tubes on it) . Remove the audio chassis by pulling off the 2 modular plugs and loosening the 4 green captive phillips screws. Lift the audio chassis onto an appropriate workspace and turn it upside down.
BITX40 - Receiver Audio Mods - YouTube
https://www.youtube.com/watch?v=v_3Oot08HPU
A wee demo of the BITX40 showing off a couple of little modifications that were made to improve audio on the receiver and reduce hiss. There is also a freque...
eSSB Audio Mods for Amateur Radio Hi-fi Audio
http://www.nu9n.com/Mods_TX_RX.html
Kenwood TS-950SD / SDX Series (Extensive TX and RX Mods by WZ5Q) Kenwood TS-870 ACC2 Audio Input Modification (C131 Mod) Kenwood TS-850S / DSP-100 (Transmitter and Receiver Mods by W5JAY & W9AC) Yaesu FT-1000MP Series Mods - (Transmit and Receiver Mods) Extensive mods by W5CUL and VE7RF
Audio Classics - Modifications
https://www.audioclassics.com/mods
Modafferi Mod. B- power supply - improved regulation, less hum. RF selectivity improved for better spurious rejection. IF regeneration fixed - better weak signal reception. IF 'tailbiting' fixed - this eliminates degraded reception at 96.3 and 107.0 Mhz from ninth and tenth IF harmonics. Stereo decoder slew-rate optimized by modifying op-amp
The AM Window: Tech: Mods
https://www.amwindow.org/tech/htm/mods.htm
Viking 500 Audio Mods by Tim, WA1HLR. Collins 75A-4 Audio Mods - by Don, K4KYV. HQ Series Receiver Audio Mods - by Larry, W9MDX. Johnson Valiant Mods - by Keith, WA1HZK. DX-60 Audio Mods - by Bob, K4TAX. PTT for Viking II. FT-102 Overshoot Fix - by Mal, NC4L. T-368 Audio Mods - by Steve, N9FOY. FT-1000D Mods - by Bill, W3DUQ. HW100/101 & SB101/102 Mods - by Chris, …
AUDIO MODIFICATIONS
http://www.high-endaudio.com/Modifications.html
I have performed, literally, thousands of modifications in my audio career. The first was around 1979*, when I changed an amplifier, with the help of a friend, from pentode into triode.Then in 1981, when an (then new) audiophile friend encouraged me to change the coupling capacitors in that same power amplifier (the Dynaco Mk.VI).The improvements I heard, at such a modest …
The AM Window: Tech: Mods: Slab Bacon RX Review
http://www.amwindow.org/tech/htm/slabrxreview.htm
With a few simple mods, this has become one of my most favorite receivers. With one audio mod courtesy of W3JN (clip out one cap in the ANL circuit), and a few of my own (change the values of 2 caps, swap the output transformer and change the output tube from a 6K6 to a 6V6), it will make very pleasant warm audio that is not quite full Hi-Fi, but very easy on the ears.
Klipsch Forte and Forte II History and Modifications
https://audiomods.datsunzgarage.us/forte/
MODS BELOW: On my original Forte crossover I kept the stock values and switched out the factory film caps for Dayton 1% PPs, an audio-quality resistor, and upgraded the woofer's electrolytic capacitor. I also upgraded the tweeter coil to a larger gauge air coil. Around 2008 I replaced the tweeter and midrange diaphragms with new factory versions.
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