| Author |
Topic: convert mic input level to guitar input level? |
Dennis Detweiler
From:
Solon, Iowa, US
|
Posted 14 Jul 2017 8:29 am |
|
How do I convert a mic input level on an amp to a guitar input level?
_________________
1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
|
|
|
Bill Hatcher
From:
Atlanta Ga. USA
|
Posted 14 Jul 2017 9:30 am
|
|
look at the schematic and see what impedance the input is. if its quarter inch in....thats usually high impedance. plug in and see what it sounds like! you might not have to do anything.
what is the model of the amp? if its a fender....plug in! |
|
|
|
Dennis Detweiler
From:
Solon, Iowa, US
|
Posted 14 Jul 2017 11:09 am
|
|
I can't find a schematic anywhere on-line. It's quarter inch input. It's a Lesmann accordion tube amp built in the late 50's to early 60's.
_________________
1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
|
|
|
Bob Lawrence
From:
Beaver Bank, Nova Scotia, Canada
|
Posted 14 Jul 2017 3:57 pm
|
|
Just try it
Have a look at this statement
" this amp makes a fantastic guitar amp when plugged into the microphone input"
Taken from here:
http://www.creamcitymusic.com/vintage-1960-lesmann-accordio-organ-25w-1x15-tube-combo-amp/
_________________
Franklin D10, Telonics (E9)True Tone(C6) pickups, Fender Steel King , Evans (FET 500LV), Nashville 400, Quilter MicroBlock 45 amp's, Telonics FP100 volume pedal, PodXT(effects only), Boss RV3(delay & reverb),Steel Guitar Black Box,Bill Lawrence cables, Walker Seat,Peterson Flip Tuner, IVL Steel Rider, IK Multimedia IRig Pro DUO for recording. |
|
|
|
Dennis Detweiler
From:
Solon, Iowa, US
|
Posted 15 Jul 2017 1:20 pm
|
|
Thanks, I'll give it a try. I haven't powered it up yet. I want to check all of the tubes and caps first. The pictured is a different model, but likely the same guts.
_________________
1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
|
|
|
Bill Hatcher
From:
Atlanta Ga. USA
|
Posted 15 Jul 2017 4:56 pm
|
|
| Dennis Detweiler wrote: |
| Thanks, I'll give it a try. I haven't powered it up yet. I want to check all of the tubes and caps first. The pictured is a different model, but likely the same guts. |
a variac is your best friend when powering up old amps...... |
|
|
|
Jack Stoner
From:
Kansas City, MO
|
Posted 16 Jul 2017 2:16 am
|
|
| Mic level and instrument level are both very low level signals. They should both work however, if its a mic with an XLR connector you will need an adapter to 1/4". |
|
|
|
Steven Paris
From:
Los Angeles
|
Posted 16 Jul 2017 2:45 am
|
|
According to published literature from the manufacturers, the "typical" nominal level of a Shure SM-57 dynamic microphone is 1.6mV; Peavey states a nominal input level for an NV400 as 40 mV. So the guitar is generally a bit hotter, but this can vary greatly.
_________________
Emmons & Peavey |
|
|
|
Jack Stoner
From:
Kansas City, MO
|
Posted 16 Jul 2017 6:01 am
|
|
Got this from a web page that explains the various levels.
| Quote: |
Some common levels you'll see:
+4 dBu is "professional" line level, common in modern pro recording gear, and it is about 1.25 V.
0 dBv is an average line level, typical output from rackmount guitar/bass preamps.
-10 dBv is "consumer" line level, common with older and cheaper recording gear.
-20 dBu is roughly in the neighborhood of a typical instrument's output.
-30 dBu is again in the neighborhood of a typical microphone or DI box's output.
However, instruments and microphones can have a very wide range of output levels in reality, so it is most practical to think of instrument-level and mic-level in/outputs as just "a lot lower than line level", rather than calculating specific dB amounts.
|
|
|
|
|
Les Cargill
From:
Oklahoma City, Ok, USA
|
Posted 16 Jul 2017 8:03 am
|
|
It depends on what you mean by "microphone". I don't rightly know what sort of mic would have traditionally ( from the era the amp was from ) have been used.
FWIW, Ampeg amps often had "accordion" inputs. I wonder if Manley support would know anything; there is a historical connection between them and Ampeg.
Electric guitar pickups can swing a volt, peak to peak. PSG can swing more than that.
If you have a schematic ( and it sounds like you don't ) then any mods would, I would think, follow the usual Fender suspects. For the 5E3 it looks like a 1 M pot and a couple of 68K pots.
But obviously, try it first. If you need padding, I would think about doing that externally. Likewise any buffering or addition of gain could probably be done externally, usually with off the shelf products. |
|
|
|
Dave Grafe
From:
Hudson River Valley NY
|
Posted 16 Jul 2017 8:11 am
|
|
| The voltage is not as significant as the impedance. 1/4" mic or instrument inputs will be 10k ohms or higher, while an XLR mic input may be in the range of 150 - 600 ohms. You will need a transformer and not just a simple adapter, if you want to plug an XLR mic into a 1/4" input. |
|
|
|
Jack Stoner
From:
Kansas City, MO
|
Posted 16 Jul 2017 9:05 am
|
|
I've connected mic's to guitar inputs. They work OK with an adapter.
Older mic's that were high impedance and have a cable with 1/4" plug attached. |
|
|
|
Dennis Detweiler
From:
Solon, Iowa, US
|
Posted 17 Jul 2017 8:55 am
|
|
This is a 1/4 inch mic input on the amp and wanting to plug a guitar into it.
_________________
1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8. |
|
|
|
Godfrey Arthur
From:
3rd Rock
|
Posted 23 Aug 2017 9:51 pm
|
|
Rock guys used to use Bogen PA amps for guitar.
I would just plug in and go for it without over thinking it.
Your guitar's pickups would have an effect on how the input on the amp reacts and if you use pedals, swap guitars it would be a different amp all the same.
Hard to dial in a one size fits all impedance as is the case with most guitar amps anyway made even today.
Not unless you have one of these variable impedance selector thingies:
Little Labs Multi Z PIP
18 watt Bogen HE10 PA amp.
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
|
|
|
