Search found 596 matches

by Anvil Amps Alan
Thu Jul 27, 2023 10:41 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Calculating slotted port size in 2x12?
Replies: 22
Views: 8899

Re: Calculating slotted port size in 2x12?

in a sealed Cab you can reduce the internal volume (with a partition, or fit another sealed box inside to take up space?) to reduce bass response. Bricks not a good idea Polystyrene Should work but I have not tried it. Smaller Cab (Sealed) gives back pressure to the cone, damping excursion. Strange,...
by Anvil Amps Alan
Tue Jul 25, 2023 3:54 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Calculating slotted port size in 2x12?
Replies: 22
Views: 8899

Re: Calculating slotted port size in 2x12?

Just thought I should mention The boundary effect. The placement of speakers or open back combo Amps when setting up a stage can drastically improve loudness. If a speaker is placed against a wall (pointing outwards of course), Theoretically you will get a 3dB increase in SPL. (twice as loud) Applie...
by Anvil Amps Alan
Sun Jul 23, 2023 2:51 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Calculating slotted port size in 2x12?
Replies: 22
Views: 8899

Re: Calculating slotted port size in 2x12?

http://www.troelsgravesen.dk/BOX-PORT-CALC.htm Thanks for the link, read it through twice, bit over my head though. Still unsure how I would calculate the port length if it’s cut out of the bottom of the cab? For a rectangular port the length remains the same. Take the diameter of round port and ca...
by Anvil Amps Alan
Mon Jul 17, 2023 12:17 pm
Forum: Artists
Topic: John Hanlon First Video ever?
Replies: 2
Views: 1942

John Hanlon First Video ever?

by Anvil Amps Alan
Thu Jul 13, 2023 1:34 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Anvil Amps now in Paeroa
Replies: 13
Views: 7958

Re: Anvil Amps now in Paeroa

dayl wrote: Thu Jul 13, 2023 12:50 pm Nice one. Paeroa been on the up and up over the past decade. Good to see.
I seem to be Feral enough to fit in here.
Always liked Paeroa, Shame the Battle of the Streets has been canned.
by Anvil Amps Alan
Thu Jul 13, 2023 9:51 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Anvil Amps now in Paeroa
Replies: 13
Views: 7958

Re: Anvil Amps now in Paeroa

That sign is about 20 years old, Made it when I was doing Car Audio & Alarms for people who wanted to sit in the back seat of their car and watch over my shoulder, one old guy who thought it acceptable for his small dog trying to lick my face while I was working in the front on the stereo instal...
by Anvil Amps Alan
Thu Jul 13, 2023 9:27 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Anvil Amps now in Paeroa
Replies: 13
Views: 7958

Re: Anvil Amps now in Paeroa

Not yet.
There are a few people in the wings with Amps to Doctor.
by Anvil Amps Alan
Thu Jul 13, 2023 9:14 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Anvil Amps now in Paeroa
Replies: 13
Views: 7958

Anvil Amps now in Paeroa

Hi all,
Just a heads up for Valve Amp owners in the Waikato area.
I have moved away from all the traffic jams and set up my Repair Workshop in Paeroa.
Still setting up and things are a bit of a mess,
IMG_2441.jpeg
IMG_2441.jpeg (3.27 MiB) Viewed 7958 times
but I have done a couple of repairs already.
by Anvil Amps Alan
Mon Mar 20, 2023 12:03 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: MikeC Sixty-One SRT
Replies: 123
Views: 210026

Re: MikeC Sixty-One SRT

You could try larger grid resistors on the EL84s too. Never heard of the cathode zener trick - interesting idea. Fender Bassbreaker 15 has Zeners which always go short circuit and cook the output bottles. I have removed them on 2 amps now. They C*#ts of amps to work on but you can clip the diode le...
by Anvil Amps Alan
Sun Mar 12, 2023 7:45 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Rockit Super Lead 130 (Mk6) - Lead Channel
Replies: 7
Views: 3359

Re: Rockit Super Lead 130 (Mk6) - Lead Channel

Because Anil opted to mount the components on the solder side any tech would find that section easy to read like a schematic. I knew Him back then. I would offer to help but I am presently moving to Paeroa. I am sure Clarry Schollum or Mark Maloney could sort it for you. The first thing I would repl...
by Anvil Amps Alan
Sat Oct 15, 2022 10:25 am
Forum: Amp Talk
Topic: Jansen 12 Sixty head repair
Replies: 13
Views: 1972

Re: Jansen 12 Sixty head repair

I am currently working on a 12 100 which has been seriously molested internally.
Do you have any more gunshots of your chassis which you could share?
by Anvil Amps Alan
Thu Oct 13, 2022 1:01 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Eyelet board question
Replies: 16
Views: 3870

Re: Eyelet board question

I prefer to use Turrets instead of Eyelets, Made a replacement board for a Fender Twin a while back, dimensions can be the same but made of 3mm turret material.
by Anvil Amps Alan
Tue Sep 27, 2022 10:21 am
Forum: Guitars
Topic: Engl Amp?
Replies: 27
Views: 4272

Re: Engl Amp?

Engl are almost impossible to repair because the stacked PCBs make them nightmarish.
I won't touch them and I don't think Clarry will either.
by Anvil Amps Alan
Sat Jun 11, 2022 11:18 am
Forum: Amp Talk
Topic: The Impedance Question
Replies: 19
Views: 2299

Re: The Impedance Question

I have Resistance to Impede the Reactance here, also the Reluctance to mention the speaker coil back EMF?
by Anvil Amps Alan
Wed Apr 06, 2022 9:39 am
Forum: Amp Talk
Topic: NAD - Jansen Bassman
Replies: 30
Views: 4654

Re: NAD - Jansen Bassman

sizzlingbadger wrote: Tue Apr 05, 2022 6:22 pm I wonder what that little signal diode is in there is for.
Bias rectifier