hafler t2 preamp

slagg · 12-22-2007, 12:12 AM

hello,can anybody tell me what the tt2/d.o.t.is on this schemo.baught this on ebay and this trans?/part is missing any thoughts?tried a reverb trans but thats not it.

Enzo · 12-22-2007, 12:49 AM

It is a small transformer. I'd say the OT in DOT means output transformer.

Have you tried contacting the manufacturer? They might even sell you the part.

slagg · 12-22-2007, 01:01 AM

yes i tried hafler/rockford.they nolonger support the hafler.iwas lucky they could get me a schemo thats all the info they have.i have run into a brick wall on this unit,really sucks

52 Bill · 12-22-2007, 05:53 PM

From the circuit position it is an output transformer, but the question is what the secondary should be rated at. What happened when you installed the reverb transformer? Too little output?

The Fender transformer is rated something like 11K to 8 ohms. I would think that your circuit would probably need a higher secondary impedance.

slagg · 12-22-2007, 06:03 PM

yes,when i hooked the reverb tranny up it had almost no output.and i don't know how i can figure out the proper secondary.anywere i should start?also the orig.part was very small pcb mount type'pain in the ars!!!

Enzo · 12-22-2007, 06:14 PM

It could have been a line driver type, something like 15,000 to 600. 600 ohm lines are common. They come in pc mount small.

12-22-2007, 01:01 AM	#3
slagg Junior Member Join Date: Dec 2007 Posts: 7	hafler t2 preamp yes i tried hafler/rockford.they nolonger support the hafler.iwas lucky they could get me a schemo thats all the info they have.i have run into a brick wall on this unit,really sucks

12-22-2007, 06:03 PM	#5
slagg Junior Member Join Date: Dec 2007 Posts: 7	hafler t2 preamp yes,when i hooked the reverb tranny up it had almost no output.and i don't know how i can figure out the proper secondary.anywere i should start?also the orig.part was very small pcb mount type'pain in the ars!!!

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12-22-2007, 12:49 AM	#2
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,366	It is a small transformer. I'd say the OT in DOT means output transformer. Have you tried contacting the manufacturer? They might even sell you the part.

12-22-2007, 05:53 PM	#4
52 Bill Old Timer Join Date: Jun 2007 Posts: 1,248	From the circuit position it is an output transformer, but the question is what the secondary should be rated at. What happened when you installed the reverb transformer? Too little output? The Fender transformer is rated something like 11K to 8 ohms. I would think that your circuit would probably need a higher secondary impedance.

12-22-2007, 06:14 PM	#6
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,366	It could have been a line driver type, something like 15,000 to 600. 600 ohm lines are common. They come in pc mount small.

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