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MarcAL

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About MarcAL

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    Sydney
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    Australia

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  1. The cost difference of components between RS, Element14 or any other supplier is not a concern to me today. Back in the day as a kit builder on an apprentice wage it may have been. MarcAL.
  2. When I solder polystyrene capacitors in place I always measure them before and after soldering and use a temperature controlled soldering iron. The polystyrene capacitors that I have used came from Element14 and other sources not RS. I have used these polystyrene capacitors for about 25 years in this amplifier. The cost of parts is not an issue as the performance out weighs the cost and to me that more important as the amplifier was purchased for around $300 back in the day. If you are overly concerned about heat and placement issues measure them with an infrared temperature probe. If the heatsinks or other heat sources are a problem then place them underneath of the board. I have tried the other capacitors and these polystyrenes do sound much better. IMHO. Each to their own journey and thanks for the advice also. If I put inferior parts into the build I would never use it again and that is more than a waste. Yes be careful with what you do but do take care and experiment otherwise just throw your money at the nice big price tag and kid yourself to be happy.
  3. Hi Leinster Lad, How did the transformers go in regards with noise/hum? Were they quiet. The less vibration and noise the better. I tested and tweaked my transformers very late at night when all surroundings were quiet including the mains. However just stay out of the times when off peak tones are superimposed on the mains. They can add unwanted noise also and makes this task more difficult. By the way, what was the value of the supply rails with no load?
  4. Hi Leinster Lad, Thanks for bringing it to my attention however I made a typo in the polystyrene capacitors listing and C15 was meant to be C14. Sorry for the confusion. Yes, I replaced C14 with a 220pF polystyrene type and have never had any stability problems with that change. I had also used a silvered mica in the same place in a previously mod some years ago with no troubles back then either. The sound that I am getting now with these polystyrene types are amazing. Relatively cheap and yields a rather large improvement to the sound quality. BB4$
  5. Hi Leinster Lad, I have replaced most of the capacitors on the 477 modules with: C2, C3, C4, C6 and C15 with polystyrene types that can be purchased from Element14. C7 and C8 stayed the same, ceramic. C1 with a Nichicon Muse ES Bipolar type. C5 with an ELNA Silmic II Electrolytic. C12 and C13 with ELNA Cerafine electrolytics. C9, C10, C11 with metalised polypropylene. I am happy with the choices so far as it does sound very clean and detailed now to the point of extreme happiness. With my next step I may replace all of the resistors with Vishay types including the 0R22 non inductive wire wounds. When I do this I may populate the new boards and then perform an A-B test on the amp to verify any further component changes and the improvements associated with such a task. Any suggestions with this would be greatly appreciated. MarcAL.
  6. This is amazing Leinster Lad, the chassis is coming along quite nicely. Very nice power supplies and soft starters with plenty of room for any future additions. One of the latest upgrades that I made recently was replacing the input coupling capacitor with a Nichicon Muse ES 2.2uF bipolar. I also have replaced all of the previous silvered mica types from a previous side-grade modification with polystyrene types and wow this really made a significant difference! The amplifier now sounds a whole lot nicer than before with clarity beyond belief. More tweaks to be done as I am still open for ideas. Keep up the good work and hope to be looking for progress reports to come.
  7. Further information: This pair of Alnico, 1" Altec Lansing 806-8A small format compression drivers have been thoroughly cleaned inside the magnetic gap and fitted with new aftermarket aluminium diaphragms, gaskets and terminals. They have been fitted with Bakelite loading caps and have the correct mounting hardware throughout. They have been tested and have no flaws in frequency response or gauss and are very closely matched with EIA codes 391418 and 391419 meaning weeks 18 & 19 of the year 1974. These compression drivers will work fine on any small format horn from 800Hz and up especially the Altec Lansing 811B Sectoral Horn and the 32A, 32B and 32C bent horns. This model driver was used in many Altec Lansing monitors including the 9849-8A and 9849-8D studio monitors, the famous Valencia, Granada and Santiago home cabinet speakers and not to forget the VOTT model the A7-8. I have found that this driver was not as harsh as some of its ceramic cousins but that is only my opinion. They can be used on other 1" throat horn flares such as the Emilar EH 800 'Bowtie", for an example. (so it does not have to be used on an Altec horn flare, but you did not hear that from me) Photos: The Fluke meter is not included in the sale.
  8. I would be very interested in purchasing Bill if that is okay as a split sale.
  9. Item: ETI Series 5000 MOSFET power amplifier. Price Range: Based on condition and photos. Item Condition: Preferred to be working but also interested as parts only. Extra Info: Amplifier can be in working order and preferably not modified with original Hitachi mosfets.
  10. Hey Alan, I have been looking at the angled plinth idea and it is brilliant in many ways. One, you can hear the Valencias without having to sit on the floor. Two, you don't have to compromise the original Altec cabinet design in any way. Three, there is no place for condensation from drink containers or over watered plants to sit on. Four, they are easy to fit or remove later down the track. Five, can be made higher to hide castors underneath without seeing them. Six, neat place to mount enhanced crossover networks that can be tweaked without removing any drivers. Seven, protects the base of the cabinet from violent vacuum cleaner heads. Eight, etc... I shall definitely consider them on my next build. 👍
  11. Brilliant work Alan!! Good to see another fine Altec brought back to life. Lucky cccrchairman, you are stoked to own these I bet. Happy listening times ahead.
  12. Hi Leinster Lad, It's good to hear from you again and getting back onto this project. I noticed that the boards are not drilled so I figured that one could use one of the old boards as a template and drill through that to keep it as accurate as the original. The soldering of the tracks would be a thing to sort out and would be open to suggestions. I'll PM you about these magnificent boards shortly. Keep up the good work!! MarcAL.
  13. The good thing with tape is that it will remove magnetic debris as well as dirt. I also use bluetack to remove any magnetic particles attached to the outside of drivers.
  14. Hi Benny, Yes, I have an orphan Altec Lansing 805 in my possession. What is the year of the horn that you have? Is it tar filled? Are you after one or are you prepared to sell the one that you have? I too live in Sydney. Kind Regards, MarcAl.
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