Looking for some help modifying my Jolida 202A into a power amp. Unfortunately I do not have schematics. My goal is to use the Jolida as a power amp for mid/highs and another a separate amp for the LF.
Thanks
Thanks
Fortunately, this 1 is easy. Look at the schematic. The Jolida 202A is a Mullard circuit power amplifier, with source selection and a volume control at the I/P.
Connect the AUX I/P jacks to the wipers of the volume controls, instead of the source selector switch.
BTW, a very simple modification will improve PSU performance. Replace the 4X 1N5408 diodes with totally compatible UF5408s. The amount of SS diode switching noise will be greatly reduced.
Connect the AUX I/P jacks to the wipers of the volume controls, instead of the source selector switch.
BTW, a very simple modification will improve PSU performance. Replace the 4X 1N5408 diodes with totally compatible UF5408s. The amount of SS diode switching noise will be greatly reduced.
Attachments
Eli,
Last time I tried working on this amp it wound up in the shop needing a transformer. Yes I am wanna be diyaudio enthusiast. I will need to study the schematic and perhaps seek some local expertise before tackling.
BTW I have had this amp since early 1995. If memory serves Jolida was entering the US market and was practically giving these away. Never regretted this purchase.
Thanks for the simple solution, schematic, and Pro tip on diode upgrade. May I ask what you meant by totally compatible? Looked Mouser.com and it seems for less than $5 I can reduce the switching noise. Amazing. I will open the hood and check to see which diodes are in my unit.
Again appreciate your help very much.
Last time I tried working on this amp it wound up in the shop needing a transformer. Yes I am wanna be diyaudio enthusiast. I will need to study the schematic and perhaps seek some local expertise before tackling.
BTW I have had this amp since early 1995. If memory serves Jolida was entering the US market and was practically giving these away. Never regretted this purchase.
Thanks for the simple solution, schematic, and Pro tip on diode upgrade. May I ask what you meant by totally compatible? Looked Mouser.com and it seems for less than $5 I can reduce the switching noise. Amazing. I will open the hood and check to see which diodes are in my unit.
Again appreciate your help very much.
Modifying 202a
About a decade ago I heavily modified some 302/202 amplifiers:
Jolida schematic questions
Now I own - in retired state 😛 -one of such modified -6072a, 12BH7a, trioded RTF EL34s- 202a, it's a very good little amplifier.
About a decade ago I heavily modified some 302/202 amplifiers:
Jolida schematic questions
Now I own - in retired state 😛 -one of such modified -6072a, 12BH7a, trioded RTF EL34s- 202a, it's a very good little amplifier.
- Status
- Not open for further replies.