JVC/Victor Tonearm Question

[ranf1970]

Hey AKers,

Hope this finds everyone well. I have a quick question. What is the difference between the JVC QL-7 and JVC-QL-A7 tonearms? I'm assuming that the one on the QL-7 is the UA-5045. What is the model number on the QL-A7?

Thanks in advance!

 

[hirscwi]

QL 7 is manual whereas QL A7 has auto stop. Otherwise they are identical. Ua7045 on both

 

[ranf1970]

Thanks @hirscwi ! Was the UA-5045 on any specific tables or was it just sold separately?

 

[hirscwi]

It was on those tables and maybe others. It's a good arm.

 

[hirscwi]

Several of these that I've seen had had a drooping counterweight. This is caused by sagging of the rubber isolator for the counterweight stub. It doesn't affect performance in any way but can be corrected by removing and reinstalling the stub. It's a simple process but I don't remember the exact steps - the method is obvious when you look closely at the arm. I believe there's a setscrew.

 

[best-groove]

Was the UA-5045 on any specific tables or was it just sold separately?

It was probably also sold separately, in fact on the QL7 and QL7A the arm is fixed to the top differently; the internal cables of the arm exit to the terminal block and from here the cables that exit to the turntable are also soldered, while other UA5045s are fixed to the top with a bolt and have a 5-pin pin output with detachable cable.

example 1





example 2

 

[ranf1970]

Thanks @hirscwi and @best-groove ! I have both a QL-7 (with the drooping counterweight) and QL-A7 (no issue). Both are bolted differently to the plinth and also look different.

I always saw that the UA-5045 and UA-7045 were quality arms, but I was not sure if they were on different tables or not.

The one thing I love about AK is learning all these different things!

 

[t4t3r]

The construction of the arms on the JVC QL tables are a little different which makes fixing the droop on some models easy and others much more challenging. If I recall, the A7 is the one with some additional parts in the rear end of the arm where the rubber piece mates to the stub/counterweight. I think the QL5 and QL7 both have a simple stub that can be unscrewed. There are a few older threads on fixing the droop which has better documented this and what it entails for the different tables.

 

[gibber]

is there anyone who has insight in effective moving mass when using the PH-200 high rigidity straight arm tube on the QL-A.. and QL-Y… series of ‘tables? The specs, ads, owners manuals of the time that i browsed yield nothing