Tannoy Reveal 6D

[Khron]

Re: Tannoy Reveal 6D

I've just started moving today - "fun"...

Either way, the 10W resistors arrived today, so after finishing two hauling trips, and dinner, i decided i had earned some "me-time", and got to work on re-res-ing ( ) and recapping these Precision 6D's.

First speaker (blue Su'Scon bulk filter caps) - first three pics are "before", the rest are "after".

Second speaker (black SamXon's, last two pics attached) - only two "after" pics. This was the one with more brown crap slathered on it, as can be seen on the big caps.

I didn't bother with replacing the two little electrolytics on the filter board (couldn't be arsed - it's been a LONG day), or the big caps (didn't have any 50-63v snap-ins).

Going with the component designations on the schematic in this thread:
- C22, C23 = Panasonic FR 47u/63v
- C15, C16 = Panasonic FR 100u/63v
- C11, C12, C1, C6 = Panasonic NHG 47u/63v
- C17, C18, C21 = Panasonic FR 18u/63v

Plus upping the dropping resistor to 10W ones. Some 20AWG(?) wire, some heatshrink, and that's that

Testing will come... more towards the weekend, if not even next week - i'll have to see when this whole moving debacle concludes

[Khron]

Re: Tannoy Reveal 6D

I've found some 10W ones on ebay from Germany, and i think i'll order both 120R ones and 220R ones, one of these days. I'll snap some photos when i crack'em open again.

http://www.ebay.co.uk/itm/Hochlast-W...Lmh73eE2N5nygQ

Yeah, they're axial, but i'll just bend one leg back down around the body, maybe tack on an extra piece of resistor leg (like what i'd need to chop off the other end), and that's that

And maaaaaaaaaaaaaybe, if i'm in the mood to "chisel" through some of the glue, i might even recap'em (small caps at least), but we'll see...

Currently waiting for some news from Lockwood Audio, about replacement supertweeters - one of them was well "caved in".

The thing is, when i found the listing for these Precisions on ebay, and after reading the description of the issue the dud speaker had, i quickly googled for some photos of the rear of the Reveal 6D's, because i remembered this thread. And as suspected, the backs looked identical, so i figured, what're the odds they just used the same electronics, just different drivers? And my hunch turned out to be correct

EDIT: At least for now, you'll have to settle for an external shot (only)

[midibob]

Re: Tannoy Reveal 6D

I'd like to see some pics when you have a moment.

Those 120 Ohm standup ceramic resistors are a pain to source. I think the originals were 5W rated but the only place I could get them from was the USA via Farnell and the cost for one or two was prohibitive.

[Khron]

Re: Tannoy Reveal 6D

All i've got to report is that the 120 ohm resistor ahead of the 7815 had failed open. For the time being, i tacked on a series pair of 68+56ohm, and she's back to life

This one was absolutely DRENCHED in that crap brown glue...

I'll see where i can get some 7-10W resistors to replace both, in both speakers, for peace of mind. One of these days...

Oh yeah, that passive crossover thing - even though i could see "W+ / W- / T+ / T-" on the pcb, that was "only" for the coax tweeter and the "supertweeter" up top.
Real stubborn screws, so i couldn't be bothered to remove the pcb to see exactly how the LCR filter was hooked up.
The coax tweeter goes through a huge 6.8uF film cap, and the "supertweeter" goes through the rest.
My hunch is, the signal to the ST goes through the other film cap (0.68uF, if memory serves), and that inductor might be going to ground, to form a 2nd order high-pass, and maybe some padding with the resistor(?).

[Khron]

Re: Tannoy Reveal 6D

Could someone please kindly ask a moderator to "update" the title of this thread to "Tannoy Reveal 6D / Precision 6D"?

I finally took hold of a pair of Precision 6D's i grabbed off ebay the other week. Same cabinet & electroncs as the Reveal 6D, just with a coax woofer / tweeter. To my surprise, it turns out this latter couple actually has an additional passive(!) crossover inside the woofer enclosure.

Seller said one's fine, but the other one only sometimes chirps or something, after several power cycles. In the words of Youtube's AvE, ye shall follow the teaching of our patron saint of teardowns, Dave Jones (EEVblog) and "don't turn it on - take it apaaaaaaa't!..", and so i did.

Further updates coming later

[Khron]

Re: Tannoy Reveal 6D

I'm gonna hazard a guess and say the brown goop's (way) cheaper than proper (non-acidic) RTV / silicone...

[midibob]

Re: Tannoy Reveal 6D

It's a shame the lifetime of these monitors are let down by the use of that gunk. It's not as if it isn't well known that this happens, why they couldn't have just used silicone!!

[waveform]

Re: Tannoy Reveal 6D

Thanks for the reply MidiBob!

Sorry for the late reply.

I've solved my issue in the most lazy way possible.

It was the digital board that was causing the LED not to light bright, and it is the board that is most affected by the brown gunk.

So I just did a lazy fix, and disconnected the Digital board as I never use it!

The LED lights brightly again, and the sound is perfect!

I'm not sure if I'll ever bother to clean that digital board, just really happy my Monitor is back to life!

Thanks again for all your help.

[midibob]

Re: Tannoy Reveal 6D

Hi,

Yep, I think I did need to remove some, can't remember which now as it was a long time ago. The worst bit was getting it off the connectors although yours doesn't seem to have any, which is lucky. I found scraping it off was the only sure way to do it as no chemicals I had would shift it.
It would be a good idea to change the caps anyway as from what I remember they are all rubbishy Chinese ones.

Keep us posted.

[waveform]

Re: Tannoy Reveal 6D

Too small, 3rd time's the charm!

[waveform]

Re: Tannoy Reveal 6D

Trying to upload multiple images from an ipad is never a good idea! Here they are:

[waveform]

Re: Tannoy Reveal 6D

Thanks a lot for this thread Midibob!
I'm also embarking on my adventure to repair my Reveal 6D.
It was making crackling sounds every so often until one day it got worse and the power LED went off.

I'm wondering if you had to desolder any components to clean the brown glue underneath them i.e. Between the component and PCB?

If anyone has suggestions on how to tackle my board from the pics, i'd really appreciate it, especially on how to clean caps with brown glue on top, or if i should replace them.

[midibob]

Re: Tannoy Reveal 6D

Yep, those screws can be tricky and the transformer has to be removed too. A good fitting screwdriver bit is essential and I suspect an impact driver may have been useful too although I don't posses one.

[Mobidik]

Re: Tannoy Reveal 6D

Oops, Sorry Midibob. I was blind after few hours of removing black ugly thing from6D pcb's I still cant believe that Tannoy used such a silicone (or whatever it is). In my unit all of connectors are ruined by oxidation. I decided to replace connectors and cables, all together with small caps. Big ones seems to be OK BTW, I found one critical cap on both PCB's . C17 (4,7u). They were leaky on both boards and caused no sound because of mute circuit low voltage on transistor base. Anyways, It works now… Also, how u guys remove the heatsink???? The screws are under the transformer and tx's screws are under the board covered with heatsink I used brute force and replaced the screws at the end….Shame on you Tannoy!!!!

[midibob]

Re: Tannoy Reveal 6D

It wasn't me that made the PCB so I don't have any PCB layout info. See a few posts back for the link to the guy who made his own.

http://www.cs.wisc.edu/~timc/e/tannoy.html

Cheers

[Mobidik]

Re: Tannoy Reveal 6D

Hi guys, hi MidiBob. Of course, I'm just the one more desperate 6D"s owner with common problems. I decided to make the pcb's from a scratch and Midibob if u can share your pcb files it will be very helpfull. At last it will save me some time possible? Thanks

[midibob]

Re: Tannoy Reveal 6D

Hi Don,

Glad you've got them OK. It's always good to have a look at the diagrams.
Well done for fixing it, why don't you let everyone know what you did as I'm sure there will be lots of interest.

[Don Stewart]

Re: Tannoy Reveal 6D

Midibob,

I realise its been a couple of years since this thread was active but I wonder if you might still have the schematics handy for the Tannoy Reveal 6D speakers.

I have just repaired a 66D which had a problem with the mute circuit and although it is now working I would really like to see the circuit diagram just to confirm my analysis of the fault and make sure my repair mod won't cause any more problems down the line.

Cheers,
Don.

I've just found the links to the zip file with the schematics

[midibob]

Re: Tannoy Reveal 6D

Try the mirrored link a couple of pages back in the thread.

http://91.121.194.115/tannoyschematics.zip

Midibob

[rbilliex]

Re: Tannoy Reveal 6D

I could use a schematic for these monitors also. Anyone?