Posting Pics on "Guitarsite"

1bassleft · Posted: Mon Oct 10, 2005 11:37 pm Post subject:

My own pic has the crucial resistors obscured by some wiring. The size of them indicates they are 2W each, and the last band looks like silver, so +/- 10% tolerance. I can't see the first two bands though. Maybe the first is brown, which would mean either 1 kilohm/10% or 1.5 kilohm/10%

TBH, I'd have to open her up again (ugh) to be sure. Out of interest, Owen, it is a 100W Super PA? And does it have the silver metal or white plexi front panel?

1bassleft · Posted: Mon Oct 10, 2005 11:43 pm Post subject:

OK, that's a 5% tolerance. See any other colour bands? There should be four in total on a resistor (this is like blind man's bluff, or "The Golden Shot")

Michael · Posted: Mon Oct 10, 2005 11:45 pm Post subject:

Gold / blue

Sorry 1b... I was between comps before and misread your question. I'll download and upload the pic so you see for yourself. 1 min.

Michael · Posted: Mon Oct 10, 2005 11:48 pm Post subject:

1bassleft · Posted: Mon Oct 10, 2005 11:51 pm Post subject:

That's the pic of my own flamin' amp!! The one I've been looking at on my own drive! That has to be the most hilarious Blind Man's buff ever, the tail was on my own ass Laughing

Owen, see my above posts for the estimation of what I think these resistors are.

Michael · Posted: Tue Oct 11, 2005 12:19 am Post subject:

haha... heck.. I saw it in Owen's post, didn't read it, and just assumed that was his. been a while since I've looked into this thread. Ah...

doompixie · Joined: 08 Oct 2005 Posts: 5

hey, my amp has a white front. i don't think the two resistors are the same value. or atleast from what i could make out they didnt look like they were in my amp (one of them was badly burned up though so hard to tell) i'll take a piccie of mine next time im with the amp. i thought i had taken pic's this time but when i went to load them onto the pc there wernt any on my dv cam Embarassed

i guess i will try replacing that resistor with one the same value as the one that is in there and power up without any valves in and see if the voltages are within spec for the ecc83's. i'll keep you posted. Smile

thanks for your help guy's.
Owen

1bassleft · Posted: Tue Oct 11, 2005 4:09 pm Post subject:

Owen, I've just opened up the Laney. I wanted to try it out as a PA for playing CDs ( Shocked

), so I thought I'd have another look inside while I had an afternoon going. I've taken a closer photo, which I'll upload later, but I think the description will be more useful to you:

6 Large filter caps (brand EIRE, JF407T AYU) 32uF, 350v DC
2 smaller caps (JF554AT, YYW) 16uF, 450v DC

The two resistors you're interested in are as follows:

Upper resistor; Red, Red, Orange (poss red, but I think orange), Silver which I make to be a 2W, 22kilohm/10% tolerance
Lower resistor: Yellow, Violet, Orange (see above), Silver = 2W, 47kilohm/10%

If the "orange" bands were red, then these resistors would be 2.2 and 4.7 kilohms respectively, but that doesn't sound right to me. I'm pretty sure they're orange. I might to be able to look up a supplier of carbon comp resistors in my favourites list. Let me know if any further help is needed.

BTW, I replaced the 12AX7 in the PI with a Mullard 12AU7. I didn't notice any great tightening of the response and distortion still comes in fairly early. For my purposes, I'm hoping to delay this a bit by replacing the EL34s with some E34Ls from the old Tesla (pre-JJ) works.

doompixie · Joined: 08 Oct 2005 Posts: 5

thanks for that, i will get piccies of my amp on thursday when i am at home, i shouldnt have any problems getting hold of the resistors as im studying electronics engineering at university so i should be able to get some through the uni.
the capacitors sound right from what i can remember aswell except my amp has 8 of the larger capacitors. the entire circuit is on one board as opposed to two and the rectifier diodes are in two straight lines down the side of the board next to the capacitors ( obviously so they could fit the extra cap's in. would be interesting to compare serial numbers and work out which of the amps is newer. will get pic's of mine for all to see anyway and when i get my HH solid state amps back i will get some pic's of them aswell and post them up.
Thank's,
Owen

1bassleft · Posted: Tue Oct 11, 2005 10:42 pm Post subject:

The Laney is very packed away now but, IIRC, the serial number is 6896. Here's the best of three images taken of the caps and resistors:

I tried to close in on the resistors but it's just a 1meg, compact camera. It was too much for the autofocus to handle.

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