Rocker 32 chassis/board pics

[Jondog]

I'm wondering if they're there to block possible interference coming off the opposite power amp circuit. Eight screws each seems a bit overkill to me, and a pain in the ( l ). The heavy transformers only need four!

I just played through the amp with the covers removed to test your theory. While it wasn't exactly a controlled experiment, it made no difference that I could hear in the sound of the amp--each side and channel sounded fine, and there was no increase in hum. If I end up hearing back from Orange about the tube layout, I will ask if they are supposed to serve any purpose other than protection. One thing's for sure--those 16 screws will not be coming out again until they have to (I like Sylvania EL84s, and might spring for a matched quad eventually to see if they make any difference in this amp).

Breaking in the speakers seems to be doing the amp some good--I feel like it's getting a little bassier.

It's not necessarily something that is going to happen no matter what, but it's possible. The shields on the preamp tubes are there for that purpose. A lot of HiFi tube stereos have caged around the power tubes for protection and to prevent interference. I can't see why else they're there.

[a.hun]

I can't either. Bit OTT though, rivalling the TT combo - possibly the most inconvenient amp I know for making valve access difficult!



Andy.

[John_BlackWolf]

Does this have the adjustable bias trim pot like new flagship amps do?

[DoktorV]

Does this have the adjustable bias trim pot like new flagship amps do?

I looked at all the pictures I took of the board, and don't see any trim pots anywhere.

[fiveightandten]

Does this have the adjustable bias trim pot like new flagship amps do?

No. The amp is cathode biased.

-Nick

[Rlw59]

Sorry for resurrecting an old thread, but since the question was asked here...

The power tube covers are a relatively new EU safety requirement. To protect us from ourselves, so we don't burn our widdle fingers touching hot tubes. On heads, the enclosure meets the requirement, but on open-back combos manufacturers have to add some sort of physical barrier.

Some manufacturers of open-back combos have added wire screens to the back panel so you can't reach in to cab, others put cages over the output tubes.

[terminatortears]

I just bought one of these. Sound is great, but I am having all sorts of buzzing on a variety of notes played. Sounds like mechanical rattling to me, but it is glassy... Taking it to a tech this week.

I was curious- do you see any issue with removing the power tube cages?

[Jondog]

I just bought one of these. Sound is great, but I am having all sorts of buzzing on a variety of notes played. Sounds like mechanical rattling to me, but it is glassy... Taking it to a tech this week.

I was curious- do you see any issue with removing the power tube cages?

My understanding is the cages had to be installed due to new electrical regulations. Could be tube rattle you’re experiencing.