Recent content by Mayank

Thank you guys. I'm back home in DC after a long stint in rural/remote Tanzania where access to stable internet & cellphone was a challenge. Need to catch up on posts/messages and action at AK ;) Rgds Mayank

June 20, 2004

Awesome! You are welcome Scott. Do share your feedback after ~20 hours of settling in. The new capacitors in the signal path should make it sound even smoother. I have to visit you and listen to your amazing set up. Stay safe & healthy my friend Mayank

Looking forward for tomorrow - I will be home after getting my second shot :thumbsup:

Sorry I am travelling - very unreliable internet here in Kigoma, Tanzania. Will reply when I get back home next week

Awesome. Congratulation on a job well done! Nothing is more satisfying that seeing (hearing?) the success of your work!! A few suggestions: 1. Do check for DC offset on the outputs - you don't want to damage your PC-80's. Replacing the dried electrolytics is a good idea and will make the...

:thumbsup: That was exactly my chain of thought too! By lifting one leg of D4 can confirm this if relay were to click. Wish Carver had incorporated a full wave rectification design here instead of saving pennies. Rgds

@lifer70 - do not replace any new parts as yet. We need to get the relay working first. Good work testing D004. My chain of thought is slightly different. Please reinstall the relay and re-solder the legs of components lifted - all except one leg of D004. Check if the relay engages with D004 in...

@lifer70: I went through my notes for a TFM-15cb which had a similar relay-not-clicking-on issue (both these amplifiers are very similar in design). Follow my chain of thought first before you replace Q4/and any other components - lift/desolder one leg of diode D004 and check if the relay comes...

Carver was notorious to have typos in the service manuals/schematic - but they did issue several service bulletins correcting the errors. In the schematic that I have Q004 is 2SC2235 NPN 800mA 120V. I would expect you have narrowed the issue with the relay circuit to just these components...

Adcom GFA-555 (not the II) and the GFA-565 mono-blocks are by far the best sounding designs by Nelson Pass for the money. Adcom's later models did get some bad press, which was partly due to sub-standard components. Like several manufacturers of that era, Adcom was also unknowingly a victim of...

Snip Snip :cool:

We are all glad to help - AudioKarma is a great place! Do let us know if your amplifier works now. Remember to carefully bring it up with a DBT/variac. You may need to recalibrate bias and check for DC offset. Recapping would be a good idea. I had a TFM-6c on the bench a few months ago - it...

P1. P3 show correct rail voltages and your emitter resistor readings are normal. To confirm if relay is bad (1) check for 12v at J005 (between blue & red cables) (2) with a DBT in place, connect an input signal (CD) and see if you get audio output at R004 (Right) & R005 (Left). If (1) and (2)...

+1 Also, assuming the two 6A fuses F001/F002 are good, with power switch on what voltages are you getting at P1, P2, P3 for +B, gnd & -B respectively? Rgds Mayank