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Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« on: January 12, 2015, 04:15:48 PM »
Hi,
Im finishing a 1272 using the Hot Rod pcb.

The transformer I have for the Output is a LO2567 (unhapped) istead of the common LO1166 (gapped).

I have the T1310 inductor.

Ive read that tou can connect the T1310 and the LO2567 to the output of the BA283 instead of  the LO1166, I just dont know whats the correct way of doing so.

Can please someone help me on how to connect this?

Thank you so much
Regards


madriaanse

Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #1 on: January 12, 2015, 09:59:18 PM »
Using the BA283AM schematic: Connect T1310 to B and M. Connect LO2567 between F and J. J (and A) should still connect to B- (0V). Wire LO2567 like LO1166 (series-series)

Good luck!

M.
« Last Edit: January 12, 2015, 10:41:35 PM by madriaanse »

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Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #2 on: January 16, 2015, 01:05:56 PM »
Using the BA283AM schematic: Connect T1310 to B and M. Connect LO2567 between F and J. J (and A) should still connect to B- (0V). Wire LO2567 like LO1166 (series-series)

Good luck!

M.

Thank you so much for your knowledge and help Martin.

I did redrawn the schematic for these connections, so it could be verified if I understood well and also for others fellow diy'rs use in the future.

Please let me know if I got

Thank You


Whoops

Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #3 on: March 14, 2015, 10:18:56 PM »
Using the BA283AM schematic: Connect T1310 to B and M. Connect LO2567 between F and J. J (and A) should still connect to B- (0V). Wire LO2567 like LO1166 (series-series)

Good luck!

M.

Thank you so much for your knowledge and help Martin.

I did redrawn the schematic for these connections, so it could be verified if I understood well and also for others fellow diy'rs use in the future.

Please let me know if I got

Thank You


Do I need a Blocking Cap Between F and the LO2567?

Thanks

shabtek

Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #4 on: March 15, 2015, 11:00:58 AM »
Quote
Do I need a Blocking Cap Between F and the LO2567?
C7 is the dc blocking cap
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

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Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #5 on: March 15, 2015, 07:25:01 PM »
Quote
Do I need a Blocking Cap Between F and the LO2567?
C7 is the dc blocking cap

Thanks,
I checked that and read that in this configuration C7 sould be changed for 220uf instead of 80/100uf in order to maintain the Low Frequency response.

Does that make sense?

thanks

r2d2

Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #6 on: March 16, 2015, 11:01:52 AM »
Please :
what type of cap is that indicated in the attached image ?

many thanks in advance
r
..... Cracking D.Vader Firewall ...  II-)

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Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #7 on: March 16, 2015, 04:40:57 PM »
Please :
what type of cap is that indicated in the attached image ?

many thanks in advance
r

Poly-Estere I don't know what it is, do you mean Polyester?

That cap can be any type Ceramic or Film Capacitor (Polyester, Polysterene,Polypropylene, etc), any will do.



Whoops

Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #8 on: March 16, 2015, 04:41:35 PM »
Quote
Do I need a Blocking Cap Between F and the LO2567?
C7 is the dc blocking cap

Thanks,
I checked that and read that in this configuration C7 sould be changed for 220uf instead of 80/100uf in order to maintain the Low Frequency response.

Does that make sense?

thanks

I checked that and read that in this configuration C7 sould be changed for 220uf instead of 80/100uf in order to maintain the Low Frequency response.

Does that make sense?

thanks

r2d2

Re: Help! 1272 as Mic Pre with LO2567 and T1310 on Output
« Reply #9 on: March 17, 2015, 11:02:03 AM »

Poly-Estere I don't know what it is, do you mean Polyester?

That cap can be any type Ceramic or Film Capacitor (Polyester, Polysterene,Polypropylene, etc), any will do.


yes you are right : polyester cap

(fast typing error , sorry)
r
..... Cracking D.Vader Firewall ...  II-)