Recent content by markse

Thanks Neil for the very useful info. Any idea what the red and blue paint dots on the tops signify? I thought they might identify the legs but they don't seem to correspond to leg positions on all of them. Mark

Hi, please help identify these transistors (?) I recently picked up. They are marked "SGS U 3282/1 523" and have a blue and red dot on the top. Thanks, Mark

Hi Radfordman, I'm very interested in your mod- what does it achieve? Are you pushing the 303 into class A operation? Is it safe? I was given an old Radford ZD50 transistor amp by a friend when it started to malfunction. He had had it for years and tried other amps but none managed to replace...

Hi, what is the "hard edge" surround used on the new Tannoys? I can't seem to find much detail except it may be a "double roll"- what does that mean? Is it literally like 2 concentric narrow roll surrounds? What's the idea behind that? Anyone know? I fixed my 15" HPDs (in Lancasters) with...

Maybe berate was a bit strong, just seems strange to me that when someone tries to share their experiences they get a load of negatives thrown at them for why they shouldn't be doing it rather than genuine interest in his findings. I don't suppose Eguth would be writing this if he wasn't...

Robert wrote: I didn't read a "full explanation" in any of your posts Robert. And I think it may be YOU who don't really understand. You are right that excessive voltage at any frequency will cause arcing, but given that the bass frequencies will cause a much larger excursion of the panel...

Hi Andrew, it's probably the rubber isolating grommits- not sure the new ones are the same quality as the old which were sort of foamed rubber I think, and check if the new ones are the correct shape internally- they should be tapered inside so only the narrow end touches the suspension shaft...

Hi Andrew, yes you got it- not sure how the lifter arrangement is inside the cap and it would be interesting to see a pic when you get that far. Re-adjusting the bearings is just a matter of carefully removing the play without applying any pressure/pre-loading, by feel and trial and error. Lock...

Hi Andrew, to access those screws you have to remove the arm tube from the housing. This is fairly easy to do on later arms without the built in arm lift mechanism you have- you just have to back out the vertical bearings after slackening the nuts and removing the cylindrical housing cap from...

No, its called precision engineering- the order in which they are tightened forces the pulley ever so slightly eccentric to the motor shaft. The pulley is balanced with them tightened in that order so the order should be repeated when re-tightening. They obviously thought it important- whether...

Hi there, the manual sounds quite clear on this really! The pulley should just pull off the motor shaft after you loosened the black and silver screw (you don't need to remove them) but after so much time it does usually stick a bit. Try pushing with the end of a ball point pen or something on...

80Khz!?! Dogs can't even hear that high! And records (cartridges) certainly can't reproduce accurate sound at that frequency, nor were they ever meant to- I think the usual limit is around 18-20Khz. The 20Hz-20KHz "human hearing range" is not really very accurate- young children may be able to...

Surely though if you use a stepup transformer with an MC you're going to be lumbered with a similar distortion- maybe worse given the larger amount of iron in the core? I wonder what Voigt used? Mark

I just find it strange that this potential pitfall of MI or MM technology has not been highlighted before in the multitude of arguments regarding the different available technologies- to my knowledge- I could be wrong. maybe it was a real issue in cutting heads where I suppose the coils are...

I did a search and found reference to a moving coil cutter Voigt designed which he is quoted as describing thus: "I think I scored with less distortion as, with the moving coil cutter, the hysteresis distortion common to most moving iron systems was eliminated."...