Search found 1160 matches

by thephantum
Sun Dec 25, 2016 7:09 pm
Forum: HT Venue Series
Topic: HT-40 Bias Question
Replies: 4
Views: 6811

Re: HT-40 Bias Question

You need to take the measurements at the output tubes. The slotted "key" at the base of the tube sits between pins 1 and 8. The rest is academic. This would be the layout on the output sockets from the bottom of the PCB (from the top it would be reversed, obviously). http://www.premierguitar.com/ext...
by thephantum
Sun Dec 25, 2016 6:15 am
Forum: HT Venue Series
Topic: HT-40 Bias Question
Replies: 4
Views: 6811

Re: HT-40 Bias Question

I just use a bias probe, which inserts a 1 ohm resistor between the cathode (Pin 8) and ground. If your ammeter is accurate enough, you should be able to measure the bias current there. Plate voltage is measured at pin 3. I would use pin 8 as ground. There is no set number for bias. Anyone who tells...
by thephantum
Thu Dec 22, 2016 4:22 pm
Forum: Blackstar Amps
Topic: Blackstar Artist 45w head
Replies: 1
Views: 2462

Re: Blackstar Artist 45w head

If they made an Artist head at 30W or higher, I would buy one in a heart beat. However, I have heard nothing about B* releasing one.

Have you tried slaving the Marshall to the Artist? You might be impressed with the results...but you would then have to carry the stack AND the combo to gigs.
by thephantum
Thu Dec 22, 2016 4:26 am
Forum: Blackstar Amps
Topic: My amp doesn't work. Please help
Replies: 1
Views: 2276

Re: My amp doesn't work. Please help

It's heat related. The problem is that could be any one of a number of things. Bottom line, it needs to go on a bench and get diagnosed.
by thephantum
Fri Dec 16, 2016 12:37 am
Forum: HT-5
Topic: HT 5, amp overdrive switch sticking
Replies: 1
Views: 15966

Re: HT 5, amp overdrive switch sticking

Sounds like a bad switch. These guys might have it, but you'd have to solder it in yourself. https://www.guitar-parts.com/
by thephantum
Tue Dec 13, 2016 11:56 pm
Forum: HT-5
Topic: HT-5H w/ Cabinet vs HT5 Combo
Replies: 10
Views: 28022

Re: HT-5H w/ Cabinet vs HT5 Combo

Your comment was that it "doesn't weigh all that much more than the head." That's a false statement. Relatively speaking, 40% more is a lot heavier than the head. The actual fact is that neither one is all that heavy, but that there is a 10 pound difference between them...that's helpful information ...
by thephantum
Tue Dec 13, 2016 9:04 pm
Forum: Blackstar Amps
Topic: HT5-R electric diagram
Replies: 4
Views: 5397

Re: HT5-R electric diagram

First of all, find another tech. Anyone that tells you they can't repair a (pretty much) standard class AB amp in push pull configuration because "it's not a Fender" doesn't know what their doing. Run away... The problem described above only applies to a small subset of amps made in late 2011/early ...
by thephantum
Tue Dec 13, 2016 8:59 pm
Forum: HT-5
Topic: HT-5H w/ Cabinet vs HT5 Combo
Replies: 10
Views: 28022

Re: HT-5H w/ Cabinet vs HT5 Combo

The HT-5RC (12" speaker) is 27 lbs (12 kilos). The HT-5RH is 16 lbs (7.5 kilos). That makes the combo 40% heavier...so it's quite a bit of difference. :mrgreen:
by thephantum
Mon Dec 12, 2016 3:29 pm
Forum: HT Venue Series
Topic: KT 77's in a HT 50?
Replies: 1
Views: 4961

Re: KT 77's in a HT 50?

There is no set number. KT77's have the same plate dissaption rate as an EL34 (25 watts), so the bias process is exactly the same: - Measure the plate voltage - Do the math - Measure and adjust bias current - Rinse and repeat until dialed in The math is: Maximum Plate Dissipation [W] / Plate voltage...
by thephantum
Sun Dec 11, 2016 10:46 pm
Forum: Blackstar Amps
Topic: HT 60 blowing fuses
Replies: 4
Views: 5177

Re: HT 60 blowing fuses

Pull all the tubes out and power the amp on. If it still blows the fuse, the tubes are not the problem.

If it doesn't blow the fuse, that doesn't mean the tubes are the problem....just that they are the first thing that should be eliminated by trying new ones.