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I'm just starting to dig into this project of converting an M8 into a mic preamp, and I have a couple questions: 1. From what I can tell, the EF86 heater is hooked up to the 5.7V secondary from the power transformer. In the EF86 data sheet it says the heater voltage should be 6.3V. I think 5.7V fal...

buildafriend wrote:What is AK-2?

Is it some kind of RC component?

Yes. It is a compensation network - resistor and a cap, sealed inside of single unit that looks physically similar to a ceramic disc cap.

I've used this mixer quite a bit over the years in studio and even as a spare PA mixer, but the time has come to put it up for sale. This is a 6 in 2 out mixer. Has 4 mic pre cards and 2 line inputs. It is a "hard stereo" mixer, meaning you get hard L, hard R or dead center (50/50). So, this means y...

Can anyone post or link me to the 6445 schematics? The old link has expired.

Thanks!

Title says it,

Anyone have a spare 424e they want to sell?

Hello Everyone, I've recently started getting some jagged sounding distortion from Track 5 on my 80-8. I've ran through some basic troubleshooting by doing the following: 1) swapped rec/rep cards (twice with different channels) 2) spray cleaned and reseated cards for each swap 3) ruled out input and...

Hi,

Is it Quantegy or Ampex? New or used?

I'm looking for 1 or 2 rolls of 1/2" tape, preferably anything 3M.

Used ok.

Anyone have some to spare? I have an upcoming project and discovered 3 rolls of ampex 456 I had had gone sticky shed!! Needless to say I am trying to avoid any of the bad year ampex stuff.


Thanks

I could build a stereo version for $400-$600 With the 4722s and 15095s that you already have - maybe even less than that. You can always use a ready made DC supply from International power. 50 bucks. All you need to do there is mount it in a box and add a small filament transformer. A single supply...

I'm interested in making a two channel version of an Altec 1567A Straying off topic a little here - I assume you mean you wish to make a pair of mono pres and not a 2 channel mixer - correct? I'm asking because cannibalizing a 1567 could result in losing lots of resale value which = DIY funds - unl...

Have you checked the relays? I can't remember how they're mounted - but if socketed try reseating. Check voltages on the relay pins. Sometimes the relay contacts will get a buildup on them. I have heard mention of the 80-8 relays occasionally getting stuck though I've never had that problem with min...

Check the fuses.

Fuse 7 is the 24V DC power supply for the record / reproduce amp. If it blows check the voltage regulator IC2 and the rectifier diodes first. I have pdf's of the schematic + manual, send me your email and I'll fire them off to you. Thanks TiredEyes, I had a feeling a voltage regulator was involved....

Cool. Thanks.

The manual was readily available online at AnalogRules at one point. Looks like they've taken it down.

Anyone have an active(AnalogRules is apparently down) link to 80-8 schematics/manual?

Or if anyone has it already downloaded - The info I'm looking for is:

What circuit is Fuse # 7 (2.5A slo-blo) tied in to?

Thanks in advance