Someone was looking for a way to increase volume about a week ago. I think it was for a payphone. The percect solution just came up on eBay..
Item #151401821716
Sorry. New tablet, I have not figured out how to save pictures yet.
TEK Model 1187-PK
Some of the photos for reference...
I have a bunch of coin phone amplifiers. I have two kinds, AT&T and APC. The AT&T amplifiers have a contact closure type loud button. Those have 3 volume levels and each press of the button cycles the volume up one level, then back down to the lowest level again. The APC amplifiers have a button with up and down arrows. I don't remember how many levels it has, but you're able to adjust it up or down at any time. If anyone has a need for either of those types, let me know.
---Eric
Thanks for the pics, Paul!!
You're welcome, Harry.
I hope you make friends with your new tablet soon!