Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Shack on March 08, 2016, 10:39:55 am

Title: couple of transformer questions (Allen)
Post by: Shack on March 08, 2016, 10:39:55 am

I am wondering which OT from allen will suit my PR build.  The TO 20, TO 22 or TO 26....I have the TP25 PT in there with a 12 inch speaker and tube sockets will be wired to accept EL-34 if I choose.
The TO 20 is in the Sweet Spot amp....and it has a TP 20 power tranny too, which wasnt on the list to buy ( wonder what the difference is between the TP 20 and TP 25 ?

thanx

Title: Re: couple of transformer questions (Allen)
Post by: sluckey on March 08, 2016, 11:31:28 am

Hoffman sells very good OTs.

Quote

I am wondering which OT from allen will suit my PR build.  The TO 20, TO 22 or TO 26

Any of those OTs will work. Specs are on his site.

Quote

wonder what the difference is between the TP 20 and TP 25

Only Dave knows.

Title: Re: couple of transformer questions (Allen)
Post by: mresistor on March 08, 2016, 02:10:19 pm

The TO20 was basically developed for upgrading a Blues Junior. The TO20B has better bass response. The TO22 is a Deluxe reverb OT. My opinion is gofor a Deluxe Reverb OT and don't look back. It will give your PR much more balls and then some. I used DR OT tranny in my HPR and it's outstanding. Sluckey's recommendation of Dougs OT's is a good one. Another couple of options are:


http://www.tedweber.com/hy041318 (http://www.tedweber.com/hy041318)


http://www.classictone.net/40-18087.html (http://www.classictone.net/40-18087.html)


this classic tone is a very nice OT   

Title: Re: couple of transformer questions (Allen)
Post by: Shack on March 08, 2016, 02:59:42 pm

I know that Slucky.....I was asking a different question and using the Allen trannies as examples per the way they are advertised...

Then.........the 041318 deluxe reverb transformer here would be about the same as the TO 22 then I presume....specs are the same, and thats the one I put in my 5E3 .

Sorry , just didnt want to buy one thing and then see where another may have been better,  my funds are limited.

Title: Re: couple of transformer questions (Allen)
Post by: Shack on March 08, 2016, 03:13:44 pm

I suppose I got caught up in the price differences...thinking that a DR OT that costs 70.00 must have something more too it than a 50.00 one , even tho specs are about the same.

Title: Re: couple of transformer questions (Allen)
Post by: Shack on March 08, 2016, 04:24:44 pm

Thank you mresistor  :icon_biggrin:

Title: Re: couple of transformer questions (Allen)
Post by: mresistor on March 08, 2016, 05:21:19 pm

BTW  you could even run 6L6, 5881, Kt88 or even 6550's with that PT it has lots of current handling capability. I have that PT in my PR and it is rock solid and huge. Coupled with the upgrade DR OT and I doubt you are going to switch to EL34's anytime soon. I run JJ 6V6 in mine and I have to use attenuator in the house. I haven't tried 6L6's yet, but they are sitting here...   :-)


that's if the bottles will fit in the chassis..

Title: Re: couple of transformer questions (Allen)
Post by: Shack on March 08, 2016, 05:33:43 pm

nice,.....thank you again for helping me make up my mind, and saved me over 20.00 too  :icon_biggrin: