Planar 78 ?

Rnickl · 17th March 2006, 02:35 PM

Can anyone tell me what would be involved to convert a Planar 78 to play 33's.

I just saw one for $60. I think is worth buying just for the RB250. Any thoughts.

Thanks,
Rick

sreten · 17th March 2006, 03:04 PM

Hi,

presumably you would need to replace the cartridge or its
stylus, and fit the smaller two step 33/45 rega motor pulley.

/sreten.

Rnickl · 17th March 2006, 03:11 PM

Is the tone arm wiring the same for mono and stereo? Will I be able to just switch the cart?

Just a pully swap? That sounds easy enough. I was expecting a motor swap.

Thanks
Rick

sreten · 17th March 2006, 03:35 PM

Hi,

I assumed Rega don't have a special 78 motor.

Most mono cartridges now have stereo pins but are internally shorted.
So the RB250 should be entirely standard.
If the arm is actually mono, then you'd need to desolder a link in the armbase.

/sreten.

wytco0 · 17th March 2006, 03:45 PM

Is this real? I have never heard of a 78 rpm Rega? I had a Rega Planar 3 for years and it could only do 33 and 45.

Rnickl · 17th March 2006, 06:00 PM

I just went and picked it up. Score for $60.

It lookes identical to the P2 except for the name on it. The clips at the cart are just soldered together, so that's an easy fix. I'll just have to turn a pully tonight on my mini lathe and I'll be rockin' out.

Thanks,
Rick

tubenut · 17th March 2006, 07:09 PM

Quote:

Is this real? I have never heard of a 78 rpm Rega?

Very real.....

Seems like a bargain of note at USD60.00

Rnickl · 17th March 2006, 07:15 PM

Anybody know what the motor RPM is?

I measured the motor pulley at 13.75mm and the platter pulley at 56.7mm, spining at 78 RPM gives me a motor RPM of 321.6. This dosen't seem correct. The motor pulley was a bit hard to measure, but I think I must be accurate within .5mm.

AMV8 · 18th March 2006, 08:15 AM

I also own a planer 78.

I asked rega if I could convert to 33/45. They confirmed that you can and sent me the replacement pulley for free - good of Rega. The actual pulley needed will depend upon whether you have a metal or plastic sub chassis.
The arm is the standard rega rb250 and has four wires already although only 3 are used with the 78 cartridge.
Don

sreten · 18th March 2006, 10:49 AM

Hi,

note the pulley required will be also need to be for 60Hz mains.

/sreten.

17th March 2006, 02:35 PM	#1
Rnickl diyAudio Member Join Date: Dec 2005 Location: San Jose, CA	Planar 78 ? Can anyone tell me what would be involved to convert a Planar 78 to play 33's. I just saw one for $60. I think is worth buying just for the RB250. Any thoughts. Thanks, Rick

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17th March 2006, 03:04 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, presumably you would need to replace the cartridge or its stylus, and fit the smaller two step 33/45 rega motor pulley. /sreten.

17th March 2006, 03:11 PM	#3
Rnickl diyAudio Member Join Date: Dec 2005 Location: San Jose, CA	Is the tone arm wiring the same for mono and stereo? Will I be able to just switch the cart? Just a pully swap? That sounds easy enough. I was expecting a motor swap. Thanks Rick

17th March 2006, 03:35 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, I assumed Rega don't have a special 78 motor. Most mono cartridges now have stereo pins but are internally shorted. So the RB250 should be entirely standard. If the arm is actually mono, then you'd need to desolder a link in the armbase. /sreten.

17th March 2006, 03:45 PM	#5
wytco0 diyAudio Member Join Date: Apr 2004 Location: Hastings	Is this real? I have never heard of a 78 rpm Rega? I had a Rega Planar 3 for years and it could only do 33 and 45.

17th March 2006, 06:00 PM	#6
Rnickl diyAudio Member Join Date: Dec 2005 Location: San Jose, CA	I just went and picked it up. Score for $60. It lookes identical to the P2 except for the name on it. The clips at the cart are just soldered together, so that's an easy fix. I'll just have to turn a pully tonight on my mini lathe and I'll be rockin' out. Thanks, Rick

17th March 2006, 07:15 PM	#8
Rnickl diyAudio Member Join Date: Dec 2005 Location: San Jose, CA	Anybody know what the motor RPM is? I measured the motor pulley at 13.75mm and the platter pulley at 56.7mm, spining at 78 RPM gives me a motor RPM of 321.6. This dosen't seem correct. The motor pulley was a bit hard to measure, but I think I must be accurate within .5mm.

18th March 2006, 08:15 AM	#9
AMV8 diyAudio Member Join Date: Jan 2005 Location: near london	I also own a planer 78. I asked rega if I could convert to 33/45. They confirmed that you can and sent me the replacement pulley for free - good of Rega. The actual pulley needed will depend upon whether you have a metal or plastic sub chassis. The arm is the standard rega rb250 and has four wires already although only 3 are used with the 78 cartridge. Don

18th March 2006, 10:49 AM	#10
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, note the pulley required will be also need to be for 60Hz mains. /sreten.

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