Galaxy 77/88/99/Melaka etc.

Caps, cap, capacitor, direct inject, bass, lows, hi fi, hifi, hi-fi, high fidelity, mod, mods, modification, upgrade, widen, wide audio, Goldfinger, Cobra, Galaxy, Ranger
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Goldfinger
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Galaxy 77/88/99/Melaka etc.

Post by Goldfinger »

ept360014b

Receive:

C36: Change to a 4.7uF, 50 Volt (or better) mylar/polyester film or non-polarized electrolytic
C38: Remove for more highs (you may like it without it removed)
C39. C154, C155: change to 4.7uF 50 volt (or better) Non-polarized electrolytic or mylar/polyester film
C157: Change to a 4.7uF, 16 Volt (or better) tantalum (observe polarity)



Transmit:

C129: Change to a 10uF, 16 Volt (or better) tantalum (observe polarity)
C187, C191: Change to 4.7uF, 50 volt (or better) mylar/polyester film or non-polarized electrolytic
C128: Want some bass boost in the mic amp? Change to a 2.2uF, 16 volt (or better) electrolytic (observe polarity)
C190: Change to a 330uF, 25 volt (or better) electrolytic (observe polarity)

Direct inject at C191
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Post by Goldfinger »

Added transmit hi-fi info:

Change C128 to 2.2uF, 3.3uF or 4.7uF, 16 volt electrolytic. This makes the inverting amplifier have a progressively more bass boost. Each change makes quite a bit of difference.

Change C190 to a 330uF, 16 volt or higher electrolytic.
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Re: Galaxy 77/88/99/Melaka etc.

Post by slowhand »

Looking for hifi cap mods for a Connex Saturn cx33 EPT360015C , The board is a little bit different .
:-)
Thanks !
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Re: Galaxy 77/88/99/Melaka etc.

Post by Goldfinger »

Looks like the DX55HP is the same. DX55HP, Connex Saturn CX33 mod posted Here
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Re: Galaxy 77/88/99/Melaka etc.

Post by slowhand »

I'll check it again later this week. But c154 and c155 in my cx33 I believe is C128 and C129. One is polarized electrolytic and other is polarized tantalum capacitor. I will try and trace it out on the schematic later this week. I really appreciate the help ! I done the rx and tx mods to my 2517 . It sounded so much better on rx I found the cx33 a little wimpy sounding lol !
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Re: Galaxy 77/88/99/Melaka etc.

Post by Goldfinger »

C128 and C129 are in the TX circuit. C154 and C155 are RX. The mods and the parts locations are on another thread, which can be found by clicking on the blue word "here" above your last post. 8)
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Re: Galaxy 77/88/99/Melaka etc.

Post by Goldfinger »

Direct inject for AM at C191
SSB - C125
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Re: Galaxy 77/88/99/Melaka etc.

Post by cableguy »

After bypassing echo board alone, tx audio is super bass-y without tx cap changes. Any change to bring up the TX highs to match the lows? Thanks.
"Our main business is not to see what lies dimly in the distance, but to do what lies clearly at hand." ~T. Carlyle
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Re: Galaxy 77/88/99/Melaka etc.

Post by Goldfinger »

cableguy wrote: Mon Apr 26, 2021 8:08 am After bypassing echo board alone, tx audio is super bass-y without tx cap changes. Any change to bring up the TX highs to match the lows? Thanks.
There isn't much shunt capacitance that can be lowered any more to easily get more highs. You could try making C128 lower in value. Try changing it from 1uF to a .47uF cap.
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Re: Galaxy 77/88/99/Melaka etc.

Post by cableguy »

Goldfinger wrote: Mon Apr 26, 2021 8:44 am
cableguy wrote: Mon Apr 26, 2021 8:08 am After bypassing echo board alone, tx audio is super bass-y without tx cap changes. Any change to bring up the TX highs to match the lows? Thanks.
There isn't much shunt capacitance that can be lowered any more to easily get more highs. You could try making C128 lower in value. Try changing it from 1uF to a .47uF cap.
Thanks Goldfinger! I will try that and see how it gets along.
"Our main business is not to see what lies dimly in the distance, but to do what lies clearly at hand." ~T. Carlyle
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Re: Galaxy 77/88/99/Melaka etc.

Post by cableguy »

Goldfinger wrote: Mon Apr 26, 2021 8:44 am
cableguy wrote: Mon Apr 26, 2021 8:08 am After bypassing echo board alone, tx audio is super bass-y without tx cap changes. Any change to bring up the TX highs to match the lows? Thanks.
There isn't much shunt capacitance that can be lowered any more to easily get more highs. You could try making C128 lower in value. Try changing it from 1uF to a .47uF cap.
I lowered that C128 to .47uF per your suggestion, it did help. Thank you good sir!
"Our main business is not to see what lies dimly in the distance, but to do what lies clearly at hand." ~T. Carlyle
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