Triumph O reproducer 2min problem

[phonogal]

I just got a Triumph D2 phonograph with cygnet horn this last weekend (something I've wanted for awhile). It has a model O reproducer which plays 4 minute cylinders nicely. When playing a 2 minute cylinder, the needle wants to skip. What am I doing wrong? Thanks, Jan.

[kirtley2012]

I have no experience with O reproducers but is the stylus in good condition?, does the weight move freely with out obstruction?

[phonogal]

The 2 min stylus is in good condition. It seems almost like the carriage arm is moving slower than the needle in the cylinder groove. I don't know how this could be, if the carriage arm moves with the feed screw. It will play about 2 grooves then skip back and play them again. I have changed the lever to play 2 min and it is playing at the correct speed. This is my first Triumph and O producer so it might be that I'm not doing something right.

[kirtley2012]

Hmm, strange, I've never encountered this before, have you tried the reproducer on another machine to see if it isn't just the feed screw?, the only thing I can think of now is some incorrect parts(wrong feed screw/gears/carriage) however, the only machine I own that is anything like a triumph is a home so I'm not too sure, I'm sure someone else can shed alot more light on the situation!

[kirtley2012]

I think I know!, does the carriage seem to slip on the feed screw at all?, because I think you may have to adjust the half nut/half nut spring to make better contact with the feed screw?, is this the case?

[gregbogantz]

Are you also changing the feedscrew speed as required to change from 2 to 4 minute operation? You need to do this in addition to changing the stylus on the reproducer. On a Triumph, this usually involves shifting the collar on the feedscrew/mandrel pulley. The feedscrew must rotate at half the speed for 4 minute play than it does for 2 minute play. Shifting the collar toward the belt shifts the gearing for 2 minute - away from the belt shifts to 4 minute.

[kirtley2012]

Are you also changing the feedscrew speed as required to change from 2 to 4 minute operation? You need to do this in addition to changing the stylus on the reproducer. On a Triumph, this usually involves shifting the collar on the feedscrew/mandrel pulley. The feedscrew must rotate at half the speed for 4 minute play than it does for 2 minute play. Shifting the collar toward the belt shifts the gearing for 2 minute - away from the belt shifts to 4 minute.

Yeah, That seems more likely!

[phonogal]

It works fine for 4 min cylinders so I don't think it's slipping on the feed screw. Maybe someone who has a Triumph with an O reproducer knows what it is. I'm probably not doing something right. I appreciate your help. Thanks, Jan.

[kirtley2012]

It works fine for 4 min cylinders so I don't think it's slipping on the feed screw. Maybe someone who has a Triumph with an O reproducer knows what it is. I'm probably not doing something right. I appreciate your help. Thanks, Jan.

It's probably what gregbogantz said, that your not switching it into 2 minute mode when playing 2 minute records

[phonogal]

Are you also changing the feedscrew speed as required to change from 2 to 4 minute operation? You need to do this in addition to changing the stylus on the reproducer. On a Triumph, this usually involves shifting the collar on the feedscrew/mandrel pulley. The feedscrew must rotate at half the speed for 4 minute play than it does for 2 minute play. Shifting the collar toward the belt shifts the gearing for 2 minute - away from the belt shifts to 4 minute.

Is this not the knurded knob with the pointer by the brake lever? Or is there something else that I need to change? Jan