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Ask Amp Tech Expert Skip Simmons

Questions regarding amp history, repairs and customization

Boss Katana MK II

Posted Wed, 04/09/2025 - 06:18 by Eric P
Eric P's picture

Hi Skip and everyone, I have a Boss Katana MK II amp that I sometimes play through (e.g., our annual block party... I'm a beginner and not a gigging player). I'm not sure if anyone else has used one of these for harp. I haven't really seen anything much online in this regard.  continue reading...

  • 2 comments

Silvertone 1335

Posted Sat, 01/18/2025 - 16:45 by Stalwart
Stalwart's picture

Hi Skip, continue reading...

  • 6 comments

Laney cub10 buzzing on high notes

Posted Fri, 08/16/2024 - 07:29 by pacothedegen
pacothedegen's picture

Hi Skip, my amp buzz only when I play high notes on the harp. Could it be a microphonic preamp tube? Thank you for your help.

  • 2 comments

Ampro Speaker

Posted Wed, 05/15/2024 - 14:51 by mpman24
mpman24's picture

Hello Skip:

 

I picked up an Ampro speaker cabinet with a 12 inch Ampro (Jensen from what I understand) P12 NS speaker.  I measure it at 12.8 ohms.  2 questions:

 1.  the speaker has two 1/4 inch jacks on it.  Is that to run speakers in series?  I only use one if I want to connect it to a head, correct?

2.  I also picked up a Challenger CH18 PA amp.  It has speaker output jacks of 4, 8 and 15 ohms.  If I want to connect just this speaker to this amp, which output jack do you recommend?

 

Thanks, continue reading...

  • 2 comments

Custom amp. Reduce gain

Posted Sun, 05/07/2023 - 13:29 by gabbeauchamp
gabbeauchamp's picture

Hi,

I recently got my hands on this beautiful little custom amp based on a 1957 5F1 champ. It sounds great at high volume, but the problem is that I need an anti-feedback pedal to be able to crank the volume. Without it, I only get up to 5.

Input #2 is low and sounds best for the harmonica. I use an JT30 mic.

What do you recommend to lower the gain so I can use the amp without a pedal?

 

The 3 tubes are 12AX7, 6V6GT, 5Y3GT.

  continue reading...

  • 8 comments

5F2H - Ted Weber

Posted Thu, 05/04/2023 - 10:57 by nexo99
nexo99's picture

Does anyone have experience with Weber's 5F2H kit?

Is it a good amp?

thanks in advance!

 

  • 3 comments

Harp Gear 35

Posted Thu, 04/27/2023 - 15:46 by Harrywoo
Harrywoo's picture

Hello I am new here or I should say it's been a few years. I have just started playing again. I had sold my Fender Bassman. I t had a fantastic sound but was too heavy sometimes. I am looking at the Harp Gear 35 and can't seem to find any reviews. It looks like it could have what I want . Has anybody here played one?  Thank you

  • 3 comments

Fender Pro Jr. - Valve switch

Posted Mon, 04/10/2023 - 10:35 by nexo99
nexo99's picture

Hello!

I received to test a Fender Pro Jr. The amp is beautiful!

I wanted an opinion on the possibility of switch the EL84 valves for the 6v6 or 6L6.

thanks in advance

Nexo

  • 2 comments

Hohner HooDoo Amp

Posted Wed, 04/05/2023 - 10:52 by Graham Dent
Graham Dent's picture

Hi Skip,

I bought one of the above at the end of last year because I wanted a tube amp and it was new but half price. My only concern is that it is maybe not working properly. For example if I turn the gain down all the way it cuts the sound completely. Is this to be expected?

Any advice on this amp or anyone I should speak to, info hard to come by.

Thanks,

Graham

  • 1 comment

Mold

Posted Sat, 04/01/2023 - 08:59 by Harp Tech Kinya...
Harp Tech Kinya Pollard's picture

Hello Skip, can you advise me on the best method of eradicating mold from my Fender Bassman Tweed material. Thank you

Kinya

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