Search found 187 matches

by VintageJon
Mon Jan 02, 2006 3:40 am
Forum: Technical
Topic: Stupid valve question!
Replies: 7
Views: 1229

Does it hum with nothing plugged into Input?

-Jon

(edited for bloody spelling...)
by VintageJon
Mon Jan 02, 2006 3:39 am
Forum: Technical
Topic: tube problem?
Replies: 6
Views: 1058

Well, it could be microphonic tube or Korean pick-up as these pick-ups are known to feedback like crazy, especially with heavy distortion.

-Jon
by VintageJon
Thu Dec 29, 2005 2:36 am
Forum: Technical
Topic: How about an 'Open bonnet' tutorial?
Replies: 6
Views: 1393

Marcus,
You are in no danger changing a pre-amp tube or working on the reverb cables.

I live in the High Volt lethal interiors, so I can let you know the how and why of that.

Nice post Andy! (Howdy to ya...)

-Jon
by VintageJon
Wed Dec 28, 2005 5:34 am
Forum: Technical
Topic: question about reverb connections
Replies: 10
Views: 40408

Did it work?

Jon
by VintageJon
Wed Dec 28, 2005 5:33 am
Forum: Technical
Topic: Peavey 5150 II
Replies: 13
Views: 3245

The Peavey 5150 is problematic in my experience- unless noise and a certain ampount of harshness is not a problem for you.

IMHO is a goofy design. Damn shame as Peavey was well-designed and very reliable in the 70's and 80's. Now you may as well buy a Crate.

Just speaking from experience,
Jon
by VintageJon
Wed Dec 28, 2005 5:29 am
Forum: Technical
Topic: How about an 'Open bonnet' tutorial?
Replies: 6
Views: 1393

Assemble a clip lead with a 240 Ohm to 1K 5 to 10W resistor in series with one end, insulate lead on end without resistor. Clip resistor-end to chassis and then clip other, isulated, end to filter cap of your choice. (Orange amps have no standby so you're OK with these instructions. (Lack of Standby...
by VintageJon
Tue Dec 27, 2005 4:50 am
Forum: Technical
Topic: Please help! or120m 16xxx
Replies: 8
Views: 1050

Try changing pre-amp tubes as micro-phonic tube could cause ringing and if it had a badly displaced element it could also call humm.

-Jon
by VintageJon
Tue Dec 27, 2005 4:45 am
Forum: Technical
Topic: question about reverb connections
Replies: 10
Views: 40408

Good and simple advice from acorkos. This is probably the quickest way.

Generally speaking the low-ohm resistance side will be the input, assuming you Ohm-it-out...
Jon
by VintageJon
Thu Dec 22, 2005 5:58 am
Forum: Technical
Topic: Cleaning up a pot...
Replies: 18
Views: 2362

Forget WD-40. Use DeOxit-5 for best results. This is the Pro stuff.
I don't know if it can be shipped to the U.K. but it's the best-of-breed.

(I use it in all critical applications. Made in the USA and I get it shipped to me with the usual costs for hazarous material.)

-Jon
by VintageJon
Thu Dec 22, 2005 5:49 am
Forum: Technical
Topic: Removing Two Power Tubes in the AD140HTC???
Replies: 9
Views: 1388

Well, "let's get technical": You have to double the speaker load as the Output Transformer interrupts the Plate Impedance of the output tubes in relation to the Turns Ratio of the OutPut Transformer to the Speaker Impedance. Thus in removing two of the four output tubes you double the Output Impedan...
by VintageJon
Thu Dec 22, 2005 5:42 am
Forum: Technical
Topic: Removing Two Power Tubes in the AD140HTC???
Replies: 9
Views: 1388

Forgot to mention that you won't have much volume reduction as it'll only be 3Db- and this is what we are taught to understand as the MINIMUM the human ear can discern as a difference in volume level. Forget "power tube break-up". By the time the power tubes break-up you'll be deaf and yer ears will...
by VintageJon
Thu Dec 22, 2005 5:39 am
Forum: Technical
Topic: Minimum Wattage Cab
Replies: 18
Views: 2292

Here it's speaker rating = output rating X 2, at a minimum.

The classic engineering rule-of-thumb is 3X power-rating for everything.

-Jon
by VintageJon
Thu Dec 22, 2005 5:35 am
Forum: Technical
Topic: If I may be technical here for a second ......
Replies: 15
Views: 2059

2 X 8 = 4 Ohms, DON'T DO IT!

-jON
by VintageJon
Tue Dec 20, 2005 4:39 am
Forum: Technical
Topic: HUM
Replies: 2
Views: 844

Agree wil probable Ground Loop-

-Jon
by VintageJon
Tue Dec 20, 2005 4:37 am
Forum: Technical
Topic: ROCKERVERB 50 2x12 vs Bogner shiva 2x12
Replies: 3
Views: 1169

EVERY Orange I've seen is BETTER than every Bogner I've seen- and I've been inside lots of both.

Go with the Orange...

-Jon