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Old 14th January 2011, 05:07 PM   #1
db! is offline db!  Canada
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Default FS: semi-completed projects that I'll never finish

I've been digging though my workbench and I've come across a couple semi completed projects that I'll likely never finish.

First up, a pair of RH 807 SE amplifier boards. They were originally for a guitar amp, hence the tagboard construction. Each board is 6'' x 2 3/16", they are on 1/4'' brass standoffs. Pinouts will be provided. Also, do realize that power supply section is not included on these boards, you will need to design your own. The schematics can be found here: RH 807 - Tube Audio ...... RH DESIGN

I am asking $35 plus shipping (Should be around $5-7) for the pair
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Second item, are a set of panson audio LME4981X PCBs that are semi populated; 95% of the capacitors and resistors have been installed/will be included. I also have and will include most of the driver transistors. Power/ output transistors will not be included, the guy that was suppose to help me get them seems to have disappeared. However, you can still get them via samples.

I am asking $50 plus shipping for all 3 boards.

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Last edited by db!; 14th January 2011 at 05:09 PM.
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Old 14th January 2011, 07:38 PM   #2
qusp is offline qusp  Australia
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Hi, so the Panson boards, the second 2 are 2 different output boards, one for transistors and the other for mosfets yes? so i'm unclear, you only have a single channel for sale right? i'm interested, but need to clear a couple things up first

Last edited by qusp; 14th January 2011 at 07:41 PM.
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Old 14th January 2011, 08:10 PM   #3
db! is offline db!  Canada
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Hi there,

Sorry for not making it clearer, smaller turquoise board is the driver board, the two other boards are for for different types of transistors. The large tortoise one is for thermatrack transistors. The smaller one can be used for mosfets or BJTs depending on the LME498XX chip you use.

These boards were originally for evaluation purposes so I never bothered to get a second pair.

Cheers

Last edited by db!; 14th January 2011 at 08:25 PM.
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Old 14th January 2011, 08:52 PM   #4
qusp is offline qusp  Australia
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right, so as I thought, only of use for a sub as the boards are not for sale anymore.
hmmm still kinda interesting, I was looking at these chips for a sub to go with F5X main amp, but hasnt really appeared in the right order for me, i'll leave you with it and if it sells it sells. good deal though
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Old 14th January 2011, 09:01 PM   #5
db! is offline db!  Canada
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Since the 4 pair thermatrak boards are still available and don't appear to have changed, the new driver boards may be compatible with either of the two boards... I'll ask Panson to see if this is the case...
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Old 14th January 2011, 09:37 PM   #6
qusp is offline qusp  Australia
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never mind me, I only started reading about these type of input driver chips last night and read the datasheet, I had in my mind that the 4 pair board was the intermediate chips that the 811 needed to drive the outputs. like as a 3 board set. OK anyway i'll wait on info. please ask if there would be anything wrong with mixing the input board versions; apart from not matched colours that is =

keen on mosfets though, I have a plethora of japanese mosfets and some 240/9240 I was thinking of using with these chips if I went this way and I lament that he didnt use the balanced inputs. regardless need sleep will chat with you later today, threw an all nighter with work and its 9am

Last edited by qusp; 14th January 2011 at 09:54 PM.
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Old 15th January 2011, 03:47 AM   #7
db! is offline db!  Canada
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I just got a response from Panson and he says that the header pin arrangement is the same for both driver boards.
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Old 15th January 2011, 09:32 AM   #8
qusp is offline qusp  Australia
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yes, but is the sound/performance similar enough that you could use 2 different boards for 2 channels of a stereo output? thats the main issue
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Old 16th January 2011, 01:47 AM   #9
db! is offline db!  Canada
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Just got another reply from Panson, he says that the two boards are more or less identical. The layout was modified to accommodate different cap sizes...
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Old 21st January 2011, 10:32 PM   #10
db! is offline db!  Canada
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Figured I'd bump and update the prices...

For the 807 tagboards, I'm asking $25 shipped anywhere.

The LME498XX boards, I'm asking $40 shipped anywhere. I will include the 0.47 ohm resistors for the 4 pair thermatrak board, one MJE340, two MJE15035 and two MJE15034.
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