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Silvertone feedback

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Sep 27, 2011 9:40 PM GMT

Hi Harpers. I have a Silvertone 1472 Amp. and having trouble with feedback whileplaying in my basement. I'm using a JT 30 with a black CR 1300 ohms. I can't get the volume past 1.5 on the microphone channel or the other two instrument channels on the Amp. without feedback.I'm thinking of putting in a lower gain tube. I have a 12AU7 right now. Where would the lower gain tube go?Would it go in the top 12AX7 slot or the second12AX7 slot next to the 6V6tube. Is the feedback attributed more to the size of the room or the equipment. Any thoughts on controlling the feedback or different types of tubes would be appreciated. Thank You

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Comments (20)

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Sep 28, 2011 4:31 AM GMT
OrthodoxBlues Replied:

It is an expensive solution, but I have found the Kinder AFB to be fantastic. My amps are shared between harp and guitar, and I haven't had to substitute any tubes.

Sep 29, 2011 3:46 AM GMT
Brontotower Replied:

Thanks OrthodoxBlues. I have heard others praising the Kinder. It sounds like a great solution down the road.

Sep 29, 2011 4:31 AM GMT
OrthodoxBlues Replied:

I didn't try tube substitution, because I thought I might not like the sound for guitar (although now that I know more, I probably was wrong), but I did try a whole bunch of different, less expensive pedals. Some decreased feedback and added tone, but the Kinder AFB is in another league. It totally eliminates feedback, even in my most feeback-prone mic, and it adds tone at the same time.

Oct 05, 2011 2:03 PM GMT
arnenym Replied:

Or wait for this?

Oct 06, 2011 4:24 AM GMT
OrthodoxBlues Replied:

If that pedal turns out to be as effective as the Kinder, that will be something.

Oct 06, 2011 8:59 PM GMT
Brontotower Replied:

Hi Guys. Anyone know anything about the Rocktron Hush for combatting feedback. It is considerably cheaper Than the Kinder. Would the Rocktron be worth the money for now while I save for the Kinder or should I not bother with it. Thank You

Oct 08, 2011 5:02 AM GMT
OrthodoxBlues Replied:

I know that one of the frequent visitors here a while back swore by the Rocktron Hush, the older version, not the current one. I found one on eBay, and while it cut feedback down, it didn't eliminate it for me, although again, I use unmodified old guitar amps. It certainly is much less expensive than the Kinder, but in my set-up, it wasn't nearly as effective. I also liked the Lone Wolf Harp Tone Plus pedal, and it helped feedback, but nothing has compared to the Kinder for me.

Oct 08, 2011 4:28 PM GMT
Brontotower Replied:

Thanks again for your expertise OrthodoxBlues. Looks like I will probably get the Kinder

Oct 09, 2011 12:04 AM GMT
walterharp Replied:

i think maybe you need to ask yourself why do you want to turn it up that loud? if you want more volume for playing out, why not go with a higher wattage amp such as a bassman RI. the silvertone plus the cost of an anti feedback is probably not much less than the cost of a used RI and you end up with more volume. on the other hand i bet the kinder has good resale value. if you just need more sweep on the volume knob to find that sweet spot between distortion and feedback, then a tube swap is by far the lowest cost alternative, and the most common solution to theproblem.

Oct 09, 2011 12:37 AM GMT
OrthodoxBlues Replied:

Walter makes some very good points ... although I think that the old Silvertone has a major cool factor!

Oct 11, 2011 4:59 PM GMT
Brontotower Replied:

Hi Guys. I swapped out the top 12AX7 with a 12AU7 on my Silvertone 1472. I'm pleased with the results. I started out with a 5 wattSilvertone 1471 that I can turn the volume up to the end and get a beautiful sweet sound out of it. I got the 1472 for a little more volume and recreate the same sweet sound as the 1471. I can now turn up the volume to 7 and get that nice break up with a little more volume. I may experiment with different tubes and see how it turns out. I've just started out playingnot too long ago and learning as I go. I will keep my eyes and ears open for harp friendly gear. Thank You

Oct 18, 2011 5:29 AM GMT
Jawbone K Replied:

i have a 1482 that i've used for years. tubes as follows, p1, 12ax7, p2 and p3 12au7. the idea is, let the whole signal into the amp and then tame the feedback down some in later stages. i use either a cm or a crystal, or lately a dynamic modded to high z with this amp. i can get it high enough to work amedium sized room pretty well if there aren't too many guitars or loudass drummers around.

for bigger sound i have a replica '59 bassman modded for harp.

Oct 19, 2011 2:42 PM GMT
Brontotower Replied:

Hi Guys. Hey Jawbone. The 1472 has 2 pre amp tubes as opposed to your 1482 which has 3 preamp tubes. Which of my 2 tubes would be considered the P1 position. Which one of your tubes would be considered the P1 position? Is your last 12AU7 closest to the 6V6 power tubes?Do you find a difference in feedback or sound plugging into the microphone slot or the instrument slot. Thank You.

Oct 20, 2011 4:48 AM GMT
Jawbone K Replied:

the tube closest to the transformer is usually considered to be p1 (pre amp 1). i'm guessing here but i'd guess that a 12ax7 closest to the transformer and a 12au7 in the other slot might take the gain and hence the feedback down a notch. but be aware that with a small amp like this- 8 or 10 inch speaker, right?- overall volume may suffer considerably.

one other option, which is not perfect but can work well, is to mic the amp in a live situation and trust a sound guy to get that nice tone out to the masses.

Oct 21, 2011 2:25 PM GMT
walterharp Replied:

you may want to try a 12at7...if you get that you have a gain of about 60.. the ax = 100 the au = 19. The tubes can go in either slot, just switch them around till you get what you think is the best sound, that is 6 different sounds to check out already against the straight 12ax lineup

Oct 22, 2011 5:11 AM GMT
OrthodoxBlues Replied:

Walter, I'm appreciating the details here. So, the 12AX7 is the "strongest," followed by the T then the U. Did I get that right?

I bought an old radio; the old box will house a cool little low wattage amp, and I'll have a nice old 12AT7 out of the radio as part of the deal.

Oct 25, 2011 2:14 AM GMT
walterharp Replied:

here is a chart to help you with gain factors of tubes you can drop in instead of 12ax7

Oct 25, 2011 5:21 AM GMT
OrthodoxBlues Replied:

Awesome! Thanks for that great guide.

Oct 25, 2011 7:41 AM GMT
SUKM // R Replied:


"trouble with feedback while playing in my basement."

playing in any basement may well cause feedback issues.

Oct 26, 2011 11:07 PM GMT
walterharp Replied:

yeah, feedback from your wife and dog!

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