Gale GS401 Re-foam Project

[MartinT]

The Centre position on the UK made 401 and 402's wasn't the "flat" setting. I'm sure I remember there being "calibration" positions marked on the backplate where the knobs were aligned to, the mid almost fully up I think from long-ago memory.

I haven't got the crossovers out yet, but will measure them in the factory set position which, as you say, may not be the centre of travel.

I do have a digital sound meter and can plot responses, so will do that once I've built them and bought some stands for them.

[walpurgis]

Is your sound meter corrected for variations in mic response?

[MartinT]

Yes, I've used it for years. Mic is built-in and I use c-weighted readings.

[MartinT]

Ok, I've bought all Supersound polypropylene caps to replace the old ones, and a selection of ceramic resistors so that I can get the mid and treble levels just so. I shall replace the variable pots with blanking plugs.

The right-hand Celestion HF2000 tweeter doesn't look so good (the front mounting that contains the dome is warped), although it measures the same as the left-hand one. I shall try sticking it down with an annulus weight. If it turns out to be non-functional, I shall buy a pair of SEAS H0737 as drop-in replacements and compensate for level.

There's only one fuse shown in the circuit diagram yet there are two on the rear panel, the second one says 'HF fuse' so must be protecting the tweeter

I shall most likely delete them anyway since there is no place for fuses in speakers in my book.

[Rare Bird]

Great stuff Martin look forward to seeing the end job. Will you be buying better power resistors once you have decided on the level that suits your ears?

[MartinT]

Probably, Andr'e. What do you recommend over wirewound ceramics?

[Rare Bird]

Mills 'MRA-12' Hi Fi Collective stock em..

[MartinT]

Thanks!

[Rare Bird]

If you ever need some 2R2, 'MRA-12' ive got four spare here..

[MartinT]

Cheers mate, I may do (for the mid driver) depending on how it balances out.