Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jeff on March 02, 2014, 12:04:15 pm

Title: warbler SR Xfmrs
Post by: jeff on March 02, 2014, 12:04:15 pm: Anyone have a source or know where I can get my hands on two of the SR Xfmrs used in Sluckey's warbler or hammond AO-47?

Thanks
Jeff
Title: Re: warbler SR Xfmrs
Post by: sluckey on March 02, 2014, 12:35:27 pm: eBay
Title: Re: warbler SR Xfmrs
Post by: jeff on March 02, 2014, 03:19:48 pm: Thanks I'll try ebay(never bought anything off it before).

I think I'll try making the LDR/Neon bulb 1st but if that doesn't work out well I'll know where to look.

Thanks
Jeff
Title: Re: warbler SR Xfmrs
Post by: jeff on March 02, 2014, 07:06:35 pm: http://www.ebay.com/itm/Vintage-Hammond-H-AO-41-1-Tube-Vibrato-Preamp-Project-Must-See-Guitar-Conversion-/111290442666?_trksid=p2054897.l4276#ht_82wt_900 (http://www.ebay.com/itm/Vintage-Hammond-H-AO-41-1-Tube-Vibrato-Preamp-Project-Must-See-Guitar-Conversion-/111290442666?_trksid=p2054897.l4276#ht_82wt_900)

This work?
Title: Re: warbler SR Xfmrs
Post by: HotBluePlates on March 02, 2014, 07:16:15 pm: Yep. AO-41 or AO-47.

Don't be in a rush, and you can get them cheaply. The price fluctuates, mostly with people rediscovering this project.
Title: Re: warbler SR Xfmrs
Post by: jeff on March 02, 2014, 07:21:12 pm: How cheap is cheap?
$20 + $12 S&H too much?
Title: Re: warbler SR Xfmrs
Post by: HotBluePlates on March 02, 2014, 07:31:50 pm: Probably not.

Looking back through my notes, I bought an AO-41 on Ebay for $13 and just under $10 shipping.
Title: Re: warbler SR Xfmrs
Post by: jeff on March 02, 2014, 07:45:33 pm: OK thanks

My first thought was to build something like the warbler but using LDRs instead of the SR Xfmr.
But now that I think about it more, is there a big difference in the fact that the SR Xfmr isn't a changing resistance, but because it's a coil, it has impedance...in other words different resistance at different frequensies?

Do you think that there is something to the SR Xfmr that can't be duplicated by using LDRs in it's place?

I think I might be missing something.
Title: Re: warbler SR Xfmrs
Post by: sluckey on March 02, 2014, 08:04:06 pm: Quote
Do you think that there is something to the SR Xfmr that can't be duplicated by using LDRs in it's place?
No. Well at least for the purpose it was intended.
Title: Re: warbler SR Xfmrs
Post by: tubeswell on March 02, 2014, 11:39:03 pm: Willabe had some SR units a while back (I bought a couple off him). he may have the odd one for sale still.