Audio Innovations s500

[Spectral Morn]

I would also not use the EL34 valves switch to 5881 tubes indtead. EL34s often fail, go cheery red and blow resistors under the valve base, 6L6s another alternative, but the amp needs tweaked to run those well.

[Mikeandvan]

[/url]IMG_20200316_221330309_HDR by [url=https://www.flickr.com/photos/145505522@N02/]

Picked up the S500 today, haven't turned it on yet, been too busy dragging a new fridge freezer up my stairs, not easy alone! Looks like someone has stuck a little heat sink on the back? Think that's what it is!

[AD Audio]

[/url]IMG_20200316_221330309_HDR by [url=https://www.flickr.com/photos/145505522@N02/]

Picked up the S500 today, haven't turned it on yet, been too busy dragging a new fridge freezer up my stairs, not easy alone! Looks like someone has stuck a little heat sink on the back? Think that's what it is!

The heatsink won't be doing much at all. The main heat inside is the big dropper resistor which doesn't directly touch the rear plate. As I said before, the choke conversion replaces the big dropper and works without producing heat, thus solving the problem

[Audio Al]

Don't turn it on without speakers connected

[AJSki2fly]

I would also not use the EL34 valves switch to 5881 tubes indtead. EL34s often fail, go cheery red and blow resistors under the valve base, 6L6s another alternative, but the amp needs tweaked to run those well.

Yes that's what I did I would go for either these http://www.hotroxuk.com/psvane-12at7...ched-pair.html or http://www.hotroxuk.com/mesa-boogie-5881-str-425.html alternatively

these EL34s I found very good and replace the others with the same make http://www.hotroxuk.com/genalex-gold-lion-kt77.html

Edited to correct the EL34 equivalents, sorry my mistake

[Mikeandvan]

The heatsink won't be doing much at all. The main heat inside is the big dropper resistor which doesn't directly touch the rear plate. As I said before, the choke conversion replaces the big dropper and works without producing heat, thus solving the problem

Yer, its a bit naff innit? Just worried what else this modder has done to the insides...………..

[Mikeandvan]

This amp has el34 valves, but can't read which ones, and Flickr is down as always. Also came with a bunch of other valves that I can't make head or tail of.

[AJSki2fly]

This amp has el34 valves, but can't read which ones, and Flickr is down as always. Also came with a bunch of other valves that I can't make head or tail of.

If I recall correctly it is 4xEL34 and 2x6922 and 3xECC83, but I have a feeling the S1 and S2 may be slightly different possibly the 6922s

I am sure someone on here will know for sure, is yours a s1or s2?

[Mikeandvan]

If I recall correctly it is 4xEL34 and 2x6922 and 3xECC83, but I have a feeling the S1 and S2 may be slightly different possibly the 6922s

I am sure someone on here will know for sure, is yours a s1or s2?

s1.

[AD Audio]

I've got one in the workshop at the moment with Harma EL34s. Great sound and they are reasonable. Valve comp should be 3 X ecc83 and 2 X ecc88 or 6922. Genalex are good on both counrs. Or JJ803s

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