Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Topic started by: xcortes on April 11, 2013, 05:28:03 PM

Title: Interstage trannies for Paramour Ii
Post by: xcortes on April 11, 2013, 05:28:03 PM

If I want to test using transformers at a Paramour 2. What specs would be important to look at? Also, do I remove the coupling cap only or the grid resistor as well? Since the driver has a c4s parafeed trannies are ok, right?

Title: Re: Interstage trannies for Paramour Ii
Post by: Paul Joppa on April 11, 2013, 08:33:55 PM

Impedance should be pretty high, ideally 20K to 30K at the nominal primary. This is because the 12AT7 is running at 15K plate resistance, compared to around 8K for a 6J5 which is usually used with a 15K transformer.

If they are parafeed, you keep the cap - or rather, change it to the value required by the transformer for optimum bass response.

Dump the grid to ground resistor - or rather, change it to the value required by the transformer for optimum high frequency damping.

Title: Re: Interstage trannies for Paramour Ii
Post by: xcortes on April 12, 2013, 01:29:37 AM

Thanks. I'll look for the adequate transformers and get back