Posts by mattjones (archived2)
9 total posts8 results
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 24, 2018 13:31Have a BM5500 hooked up for my testing so far. Have tried both amp level inputs and the line input with the same results. Have tried other sources on the line input for verification. Wiggling the interconnects doesn’t ch…
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 21, 2018 23:22Thanks again all for your help. Over the weekend I replaced the 4066 and put those caps back where they were on the new chip. Crackling noises persist, but the output to the speaker has definitely been cleaned up by this…
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 18, 2018 11:57Today I was finally able to get into the shop after work and pick up some 4066 switches (TI CD4066BE) and sockets to be safe. Nick, the 33uf caps are in the correct orientation according to the silkscreen and my initial …
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 15, 2018 05:00Thanks for the tip Nick! My local electronics store has stock of these and for AUD$1 each it's worth a try 😎 Who knows what/who may have touched these amps in their life before me! Would failing standby decouplers produ…
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 13, 2018 07:53Thank you Martin, we have good continuity between the negative/ground input terminals and the chassis of the amp, as well as on the negative output. Would you recommend I work through the schematic and check every ground…
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 10, 2018 12:33I checked those transistors over the weekend and their solder was definitely stressed. I renewed the solder on them and tested them out of circuit, everything checked out ok. I also went over pretty much every trace on t…
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 5, 2018 06:28Great suggestion Jacob, thank you! I have not yet re-soldered or tested those transistors, I'll give that a go shortly and report back with my results. I'll also go over the traces this weekend, I have noticed while repl…
Beolab Penta MK1 Amp Issues
in Imported Content (Unmapped) · Jan 5, 2018 05:25Hi all, First time poster here at Beoworld! I came into possession of a pair of Penta MK1's (Australian version, 6605?) around 6 months ago and had them refoamed, but have only recently got stuck into their failing amps.…