A new Peavey classic VT to HRM conversion
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- erwin_ve
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A new Peavey classic VT to HRM conversion
Inspired by BobI's conversion of an old Peavey Classic VT to HRM I decided to do the same thing. Mine is with build in dumblelator
I'm in the middle of the build right now, here are some pics:
I'm in the middle of the build right now, here are some pics:
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Re: A new Peavey classic VT to HRM conversion
Nice looking work. Man, there's a lot of room in that chassis!
Re: A new Peavey classic VT to HRM conversion
Looking good. I used mine at the gig last night, sounded superb with a Hwy 1 Tele
Re: A new Peavey classic VT to HRM conversion
Thanks! I have some room for rent Serious; there is much room, but somehow a bit limited by the position of the OT.stelligan wrote:Nice looking work. Man, there's a lot of room in that chassis!
I'm looking forward to use mine, thanks for all the inspiration I got from your build.Bob-I wrote:Looking good. I used mine at the gig last night, sounded superb with a Hwy 1 Tele
Re: A new Peavey classic VT to HRM conversion
The innards are almost done, only heater wires are left.
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Re: A new Peavey classic VT to HRM conversion
Do you really want Both as Clean master, OD master and (master) master?
The HRM 101 uses only a Clean master and OD master, but not the third master.
The HRM 101 uses only a Clean master and OD master, but not the third master.
Diva or not? - Respect for Mr. D's work....)
Re: A new Peavey classic VT to HRM conversion
Yes, because the last knob of the built-in dlator becomes the master. And I want that pot on the front! Besides that, I had 1 hole leftbluesfendermanblues wrote:Do you really want Both as Clean master, OD master and (master) master?
The HRM 101 uses only a Clean master and OD master, but not the third master.
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Re: A new Peavey classic VT to HRM conversion
Ok, thats a good thinking
Remember to use shielded leads to/from the dumbleator. It can be a slightly noisy bucker.
Remember to use shielded leads to/from the dumbleator. It can be a slightly noisy bucker.
Diva or not? - Respect for Mr. D's work....)
Re: A new Peavey classic VT to HRM conversion
I use shielded leads; Rg178 is thin shielded wire.bluesfendermanblues wrote:Ok, thats a good thinking
Remember to use shielded leads to/from the dumbleator. It can be a slightly noisy bucker.
Re: A new Peavey classic VT to HRM conversion
And the innards done!
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Re: A new Peavey classic VT to HRM conversion
Looking good. Very cool having all that room isn't it
Re: A new Peavey classic VT to HRM conversion
Hi Bob,Bob-I wrote:Looking good. Very cool having all that room isn't it
Thnx!
That's cool indeed, but I am still touching other wires with my solder iron
- erwin_ve
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- Joined: Fri Jan 25, 2008 8:06 am
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Re: A new Peavey classic VT to HRM conversion
I fired her up today!
It squeeled like a pig at first, after disconnecting the GNFB the squeel was gone. So 2 wires at the PI has to be inverted.
Od and also Od with PAB are good sounding, no hum issues.
However the clean channel is humming like a bee(100Hz), so I suspect something is wrong at the Od/clean channel switching relays.
Also the voltages are high;
B1= 530v
B2= 529v
B3: 485v
B4: 401v
B5: 397v
F.e the plate voltage at v1a is 244V, v1b is 249v
Way too high.
My dropping string is 4,7k-22k- 2,2k
The Ps filtering at B1 is 2x100uF in series.
At B2 2x 68uF in series.
after that they are followed by the usual 1 cap(22uF) per node.
Anyone suggestions for my voltages and hum issue?
It squeeled like a pig at first, after disconnecting the GNFB the squeel was gone. So 2 wires at the PI has to be inverted.
Od and also Od with PAB are good sounding, no hum issues.
However the clean channel is humming like a bee(100Hz), so I suspect something is wrong at the Od/clean channel switching relays.
Also the voltages are high;
B1= 530v
B2= 529v
B3: 485v
B4: 401v
B5: 397v
F.e the plate voltage at v1a is 244V, v1b is 249v
Way too high.
My dropping string is 4,7k-22k- 2,2k
The Ps filtering at B1 is 2x100uF in series.
At B2 2x 68uF in series.
after that they are followed by the usual 1 cap(22uF) per node.
Anyone suggestions for my voltages and hum issue?
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- Joined: Tue May 22, 2007 12:57 pm
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Re: A new Peavey classic VT to HRM conversion
Regarding voltage issue:erwin_ve wrote:I fired her up today!
It squeeled like a pig at first, after disconnecting the GNFB the squeel was gone. So 2 wires at the PI has to be inverted.
Od and also Od with PAB are good sounding, no hum issues.
However the clean channel is humming like a bee(100Hz), so I suspect something is wrong at the Od/clean channel switching relays.
Also the voltages are high;
B1= 530v
B3: 483v
F.e the plate voltage at v1 is 240V.
Way too high.
My dropping string is 4,7k-22k- 2,2k
The Ps filtering at B1 is 2x100uF in series.
At B2 2x 68uF in series.
after that they are followed by the usual 1 cap(22uF) per node.
Anyone suggestions for my voltages and hum issue?
a) Do you have the 150K at the end of the PSU?
b) If you do, then increase the 4.7K to around 10K in order to lower the voltages in the preamp(s).
c) The higher voltage should not be a problem in the power amp. However, the 483v on B3 (PI) could be a little on the high side, depending on the voltage on the PI pin 3. A 12AX7 do not like more than 300V between pin 1 and 3 respectively pin 6 and 8.
(My new build EL34 with ODS and HRM OD's has 580V on its EL34 plates, which is not a problem....on the contrary, its great and pushed around 75watts out of a pair of EL34s. FWIW my dropping string is 12k- 22k- 2.2k)
Diva or not? - Respect for Mr. D's work....)
- erwin_ve
- Posts: 1728
- Joined: Fri Jan 25, 2008 8:06 am
- Location: Dordrecht, Netherlands
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Re: A new Peavey classic VT to HRM conversion
Hi Claus,
Thanks for your response.
I don't have 150k at the end of the PS. Will try that.
The PI voltage is 331/327v which is too high as you mentioned.
I will try a 10k in instead of 4,7k.
Thanks!
Thanks for your response.
I don't have 150k at the end of the PS. Will try that.
The PI voltage is 331/327v which is too high as you mentioned.
I will try a 10k in instead of 4,7k.
Thanks!