Teac 4010S or Teac 4010SL Which came first?

[sqdlvr]

Just a general question? Which Teac Reel-to-Reel 4010S or 4010SL came first and what were the differences? Which one is better and why? Appreciate any info.

[Mopic5]

While "S" version probably predates the 4010SL version, there was probably simultaneous production runs for both models - as most likely there was shared runs between the SL and GSL models.
Basically, the SL upgrades the S with high bias circuitry in the pre-amp.
The GSL included the Hi-Bias and added high density ferrite heads, reel locks and a pause button.
However, all lines received "mid-stream" improvements in motors, relays and other electronics as they came out.

This general rule aslo applies to the 6010 AN series as well.

- Mario

[bohhey]

I have an S and a GSL. GSL is an improvement in all areas, EXCEPT, I think that the preamp in the S sounds much better.

[Mopic5]

Hi Bill,
This could be calibration issues. With the AN-S series preamps, there are few trim pots to fall out of line. With the SL/GSL preamps, there's a squad of eq pots.
From a plug & play standpoint (soundwise, anyway) the "S" models often come out of decades in storage ready to "rock", if a little to the "boomy" side.
- Mario

[Grainger49]

I had a 4010S when we started selling the SL.

S was first.