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  • Beolab Penta MK1 - Blow Out

    Hi Just acquired a pair of Mk1s - One of the them had been battered in a move (few visible small dents in steel paneling) and the owner said the amp blew when he tried to use it (Using a BC9500. He said it smoked). Listened with a direct connection (bypassing the amp) and one of the woofers was distorting;...
    Posted to The Workbench (Forum) by Jamian on Mon, Jan 14 2013
    Filed under: 13cm, speaker, woofer, 6603, Penta, Beolab, distortion, blown, MK1
  • Beloab 150 / Penta Upgrades

    Hi all I've decided to carry out some work on my ageing Beloab 150 amps / Pentas. They were originally Beovox Penta Mk1's to which I later added Beloab 150's when they turned up. Anyway they have given good service over the years - and they are currently running cool. I feel though they are...
    Posted to The Workbench (Forum) by machineage on Sat, Mar 22 2014
    Filed under: Penta, capacitors, Opamp, Beolab 150
  • Penta - when is a bipolar not a bipolar?

    Just about to recap two pairs of Penta 1s and have four pcb 14 and four pcb 15s to compare. They are all in beautiful condition with no leaking capacitors or burned-out resistors - which makes me wonder if it it even worth recapping - is there a scientific way to test them? Surprisingly, the electrolytics...
    Posted to The Workbench (Forum) by westy12 on Tue, Dec 31 2013
    Filed under: Penta, recap, Circuit boards, Bipolar
  • Beovox RL140 / Penta Tweeters - Same Model?

    Hi all Just wondered if anyone could clear something for me? I wondered if the tweeters used in the RL140 and Penta Mk1 are the same? I have a Penta tweeter which is marked '25TNF H358' and a RL140 tweeter which is marked '25TNFX H358'. They look identical - aside from the missing 'X'...
    Posted to The Workbench (Forum) by machineage on Sun, Oct 12 2014
    Filed under: Tweeter, Penta, RL140
  • Penta Refoam surround sizes.

    Hi all, I'm restoring a pair of Penta IIs. The component upgrades are going well - thanks Martin. I'm now doing the foam surrounds. I ordered a set from GoodHiFi which arrived promptly with good customer service and communication. I have three questions for people who have done this job: Do the...
    Posted to The Workbench (Forum) by Gavin on Thu, Jan 22 2015
    Filed under: speaker, Penta, refoam, Penta repair service, rebuild, repairs
  • Beolab Penta mains hum / buzz noise

    Hi all, Further to my project of upgrading my Beolab Penta IIs, I have completed all the cross-overs, and re-foams. The results are great. I used to think the Penta design had limitations in the tweeter with poor high frequency response but now with the mods I am very happy. One issue remains which was...
    Posted to The Workbench (Forum) by Gavin on Tue, Mar 10 2015
    Filed under: Repair, Penta, hum, buzz
  • Beolab Penta MK1 6603- service

    Hello, I recently purchased a pair of Beolab Penta MK1 6603s. One works great, but the amplifier on the second one becomes exceedingly hot when in use. After reading several other posts, the general consensus seems to be that the potentiometer needs to be replaced, along with replacing all of the caps...
    Posted to The Workbench (Forum) by Allen14 on Mon, Feb 29 2016
    Filed under: speaker, Penta, amplifiers, Penta repair service, service, overheating, penta 1
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