Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on March 15, 2013, 06:11:21 pm

Title: Univox U45b clone - ecl86 in place of ecl82 ?
Post by: kagliostro on March 15, 2013, 06:11:21 pm

Is possible realize a clone of the Univox U45b using pcl86 tubes in place of ecl82 tubes, without any other mod than the use of a proper PT and OT ?

Thanks

K

Title: Re: Univox U45b clone - ecl86 in place of ecl82 ?
Post by: DummyLoad on March 15, 2013, 07:16:39 pm

Yes. Shouldn't be a problem.

--pete

Title: Re: Univox U45b clone - ecl86 in place of ecl82 ?
Post by: tubeswell on March 15, 2013, 09:03:21 pm

The pentode in a PCL86 is 9W and the triode is 1/2W, and the heaters are 13V (the triode and pentode filaments within the tube are in series)

Title: Re: Univox U45b clone - ecl86 in place of ecl82 ?
Post by: darryl on March 15, 2013, 09:12:55 pm

The U45b circuit has a tremolo speed control, but no depth control. I'd change R21 to a 500k potentiometer so the tremolo intensity can be adjusted.

Title: Re: Univox U45b clone - ecl86 in place of ecl82 ?
Post by: kagliostro on March 16, 2013, 02:15:04 am

Many Thanks to All

K