RG-1 Recap

[MIJ_Pioneer]

My brothers play a lot of vinyl and the RG-1 is a neat addition that isn't too intrusive. Its got its time and place (ZZ-Top HiFi Momma) and is a lot of fun. It's also a perfect piece for a first timer to restore. Its got a pot, toggle switches, wafer switch (not sure what they are called), plenty of caps, lots of transistors, diodes, etc etc. Its very open as well and easy to service. Had my brothers in on the fun and they performed their first restoration. They are better than me because not one transistor orientation was screwed up and there was no smoke show (bit of a let down if you ask me).

Used a lot of @xlbee 's list. Made it easier for the caps. I modified the list and upped all elec. caps minus the BP ES to 50v. Also added diodes, transistors and film caps. Replaced the 100pf ceramics as well.

Xlbee's post: https://audiokarma.org/forums/index.php?threads/pioneer-rg-1-recap-completed.424230/

Sounds great after the recap!

 

[MIJ_Pioneer]

RG-1 Processor Assembly AWM-086

C1 0.47 35 CSZ A 0.47uF 35V Solid Tantalum Electrolytic Radial Polarized - MKS2C034701E00JSSD

C2 0.47 35 CSZ A 0.47uF 35V Solid Tantalum Electrolytic Radial Polarized - MKS2C034701E00JSSD

C3 + C4 = 100p Ceramic = 505-FKP2100/100/2.5

C5 1 25 CSZ A 1uF 25V Solid Tantalum Electrolytic Radial Polarized - MKS2C041001F00JI00

C6 1 25 CSZ A 1uF 25V Solid Tantalum Electrolytic Radial Polarized - MKS2C041001F00JI00

C9 10 25 CE A 10uF 25V Aluminum Electrolytic Radial Polarized 647-UPW1H100MDDDD

C10 10 25 CE A 10uF 25V Aluminum Electrolytic Radial Polarized - 647-UPW1H100MDDDD

C17 1 25 CSZ A 1uF 25V Solid Tantalum Electrolytic Radial Polarized MKS2C041001F00JI00

C18 1 25 CSZ A 1uF 25V Solid Tantalum Electrolytic Radial Polarized MKS2C041001F00JI00

C19 47 25 CH A 47uF 25V Aluminum Electrolytic Radial Polarized 647-UPW1H470MED

C20 47 25 CH A 47uF 25V Aluminum Electrolytic Radial Polarized 647-UPW1H470MED

C21 1 50 CE A 1uF 50V Aluminum Electrolytic Radial Polarized MKS2C041001F00JI00

C22 1 50 CE A 1uF 50V Aluminum Electrolytic Radial Polarized MKS2C041001F00JI00

C25 + C26 = 100p Ceramic = 505-FKP2100/100/2.5

C27 4.7 25 CE A NL 4.7uF 25V Aluminum Electrolytic Radial Low Leakage Polarized 505-MKS2C044701M00JO

C28 4.7 25 CE A NL 4.7uF 25V Aluminum Electrolytic Radial Low Leakage Polarized 505-MKS2C044701M00JO

C29 470 35 CE A 470uF 35V Aluminum Electrolytic Radial Polarized 647-UPW1H471MHD1TO

C30 470 35 CE A 470uF 35V Aluminum Electrolytic Radial Polarized 647-UPW1H471MHD1TO

C31 100 25 CE A 100uF 25V Aluminum Electrolytic Radial Polarized 647-UPW1H101MPD

C32 100 25 CE A 100uF 25V Aluminum Electrolytic Radial Polarized 647-UPW1H101MPD

C33 100 16 CE A 100uF 16V Aluminum Electrolytic Radial Polarized 647-UPW1H101MPD

C34 100 16 CE A 100uF 16V Aluminum Electrolytic Radial Polarized 647-UPW1H101MPD

C35 220 16 CE A 220uF 16V Aluminum Electrolytic Radial Polarized 647-UPW1H221MPD

C36 220 16 CE A 220uF 16V Aluminum Electrolytic Radial Polarized 647-UPW1H221MPD

C37 220 16 CE A 220uF 16V Aluminum Electrolytic Radial Polarized 647-UPW1H221MPD

C38 220 16 CE A 220uF 16V Aluminum Electrolytic Radial Polarized 647-UPW1H221MPD

C43 10 10 CH A NP 10uF 10V Aluminum Electrolytic Radial Non-Polar 647-UES1V100MEM

C44 10 10 CH A NP 10uF 10V Aluminum Electrolytic Radial Non-Polar 647-UES1V100MEM

RG-1 Switch Assembly AWS-089

C1 22 10 CE A 22uF 10V Aluminum Electrolytic Radial Polarized 647-UPW1H220MDD

C2 22 10 CE A 22uF 10V Aluminum Electrolytic Radial Polarized 647-UPW1H220MDD

Transistors:





2SC1312 —> KSC1845 = 6

2SC945 —> KSC945 = 8

2SA725 —> KSA992 = 6

2SC1384 —> KSC2690 = 1

Diodes:

RG-1 Processor Assembly AWM-086





D7+D8 on 086 = 512-1N5245B

1s1555 = 4148

1s1885 = 4 = 512-UF4004

 

[ivandezande]

Great work and writeup!

 

[hugo454]

nice!

 

[rcs16]

You want ksc945c for center collector pinning
1s1885? Is it not a std recovery type? If so use a 1n4002,3,4
I do not think you really need to change the diodes

 

[MIJ_Pioneer]

You want ksc945c for center collector pinning
1s1885? Is it not a std recovery type? If so use a 1n4002,3,4
I do not think you really need to change the diodes

Ah I didn't think much about it, found a post where MTF suggested UF as a replacement. Just searched a bit more there is another thread/post where MTF mentions these are not for general rectifier use. Well it's working now but I have spares and will swap them out. Good catch thank you.

Googled and saw MTF suggesting the replacement, thought it was good as gold:
https://audiokarma.org/forums/index.php?threads/latest-recap-list-for-sx-1010.636587/#post-8475830

https://audiokarma.org/forums/index...ner-please-help-me.678100/page-2#post-9056451

 

[rcs16]

Really depends on the application. I did not look at your links but I assume they were being used as clamps between the amp output stage supply and the driver supply so in that case a faster recovery diode might be a better choice but pioneer did not think it was necessary or the parts were not available at that time so they used what they could get

 

[Loudpipe]

Did the resto improve the sound?

I like the suggestion of recapping one of these as a first vintage audio project. Just bought one and supposedly it works fine (waiting on shipping), but might give it a shot if not.

 

[MIJ_Pioneer]

Give it a shot. It's a perfect first time unit. The improvement in sound was noticable, although it sounded pretty good untouched.

Make sure to use the 1n4004 diodes like RCS suggested.