Search found 549 matches

by MikeC
Fri Nov 27, 2020 11:07 am
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

Last thought from me, maybe email Dr.Z & explain that you are way "down under" in NZ and sending he amp to him is impractical. Ask if he'd provide the MKII MV & Reverb changes in a schematic so your local tech can do the mods.
by MikeC
Fri Nov 27, 2020 9:38 am
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

I think you are right :)
by MikeC
Fri Nov 27, 2020 8:29 am
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

From the Dr. Z forum:- Reverb tank info ( Older: Accutronics 8AB3A1B ), ( Newer: P-RMOD-8AB2A1B ). Both tanks have the SAME model number so are technically the same. The MKI (Older) tank is made by Accutronics, the MKII (Newer) tank is made by MOD. So your "new" tank is the correct model.
by MikeC
Thu Nov 26, 2020 9:59 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

It seems there have been 3 mods to the MKII - a different MV circuit, different output tubes and a different reverb circuit. Mike Zait (DR. Z) said that by changing the MV circuit he could then get a better, more lush reverb (which he also said was the MKI amp's "archilles heal"). Without a factory ...
by MikeC
Thu Nov 26, 2020 9:30 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

There was something wrong earlier. I replaced all the tubes, didn't fix it, then found that the reverb control pot was actually faulty, replaced that, much better now. I don't think there's anything wrong with it anymore. The reverb on the older model Maz 18 I have is generally regarded as it's 'ac...
by MikeC
Thu Nov 26, 2020 9:20 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

There could be something wrong of course including a bad reverb send tube, recovery tube or even a dodgy tank. Is the reverb weak?
by MikeC
Thu Nov 26, 2020 9:08 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

The new tank is a perfect "fit" for your amp apart from that it has "long decay" over the correct tank's "medium decay". So reverb should be more "washy" with the new tank verses the correct tank.
by MikeC
Thu Nov 26, 2020 3:57 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

A few other things too - see below... Char #1 - Reverb Type 4 = Type 4 Char #2 - Input Impedance A = 8 Ohm (White) B = 150 Ohm (Black) C = 200 Ohm (Violet) D = 250 Ohm (Brown) E = 600 Ohm (Orange) F = 1,475 Ohm (Red) Char #3 - Output Impedance A = 500 Ohm (Green) B = 2,250 Ohm (Red) C = 10,000 Ohm (...
by MikeC
Thu Nov 26, 2020 3:12 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

I just did a little Googling - the correct tank is a 8AB2A1B. What you got?
by MikeC
Thu Nov 26, 2020 3:06 pm
Forum: Amp Talk
Topic: Modding a reverb circuit
Replies: 31
Views: 283

Re: Modding a reverb circuit

How difficult would it be to covert the reverb on my handwired point to point Dr Z Maz18 amp to be more Fender-ish? Does it just come down to component values or do different amp companies have completely different approaches to generating reverb? It's a tube driven spring reverb. Maybe best to try...
by MikeC
Wed Nov 25, 2020 8:08 pm
Forum: Selling
Topic: JB's mega sale, Katana 2x12 cab, expression pedal
Replies: 20
Views: 394

Re: JB's mega sale, Katana MK2, pedals etc...

So its that time again, complete rig re-jig, I really want to get myself a Dumble ODS style amp so I'm having a massive clearance! Tell you what, I've been chatting with marshmallow & I'm getting some ODS fever as well. I reckon I'm gonna build one as my next project 8) We've been having some back ...
by MikeC
Wed Nov 25, 2020 7:50 pm
Forum: Selling
Topic: JB's mega sale, Katana 2x12 cab, expression pedal
Replies: 20
Views: 394

Re: JB's mega sale, Katana MK2, pedals etc...

So its that time again, complete rig re-jig, I really want to get myself a Dumble ODS style amp so I'm having a massive clearance!
Tell you what, I've been chatting with marshmallow & I'm getting some ODS fever as well. I reckon I'm gonna build one as my next project 8)
by MikeC
Wed Nov 25, 2020 3:02 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Tweed Deluxe D-style
Replies: 32
Views: 1268

Re: Tweed Deluxe D-style

Marshmallow wrote:
Wed Nov 25, 2020 3:01 pm
MikeC wrote:
Wed Nov 25, 2020 2:44 pm
"Yea he's awesome. If I have questions regarding his circuit, I just ask him directly through messenger haha."

Do you really?
Yea haha
Great to know he's approachable like that :)
by MikeC
Wed Nov 25, 2020 2:44 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Tweed Deluxe D-style
Replies: 32
Views: 1268

Re: Tweed Deluxe D-style

"Yea he's awesome. If I have questions regarding his circuit, I just ask him directly through messenger haha."

Do you really?
by MikeC
Tue Nov 24, 2020 5:56 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Tweed Deluxe D-style
Replies: 32
Views: 1268

Re: Tweed Deluxe D-style

very cool! I though dumbles were pretty much Fender Twin-based. Great work @Marshmallow Thanks! I think howard modded a few tweed amps back when he first started and that's also including a 5e3. Circuit is very simple. MV, Effects loop and NFB from Robinette as well. The break up is great. Rob Robi...